A truck moves 70 m east, then moves 120 m west, and finally moves east again a distance of 90 m. If east is chosen as the positive direction, what is the truck's resultant displacement?

In one-dimensional motion, the average speed of an object that moves from one place to another and then back to its original place has which of the following properties?

An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the average speed of the object?

A bird, accelerating from rest at a constant rate, experiences a displacement of 28 m in 11 s. What is the average velocity?

A student throws a ball straight up. For which situation is the vertical velocity zero?

A railroad train travels forward along a straight track at 80.0 m/s for 1 000 m and then travels at 50.0 m/s for the next 1 000 m. What is the average velocity?

On a position versus time graph, the slope of the straight line joining two points on the plotted curve that are separated in time by the interval delta t, is which of the following quantities?

A European sports car dealer claims that his car will accelerate at a constant rate from rest to 100 km/hr in 8.00 s. If so, what is the acceleration? (Hint: First convert speed to m/s.)

A v vs. t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 5 s the acceleration of the ball is zero. We know that at t = 5 s,

The value of an object's acceleration may be characterized in equivalent words by which of the following?

An object is dropped from a height. Once it is moving, which of the following statements is true, at least at one point?

The slope of the acceleration vs. time curve represents:

A ball is pushed with an initial velocity of 4.0 m/s. The ball rolls down a hill with a constant acceleration of 1.6 m/s2. The ball reaches the bottom of the hill in 8.0 s. What is the ball's velocity at the bottom of the hill?

A cart is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 2.0 m/s². What is the magnitude of the cart's displacement during the first 6.0 s of its motion?

A vehicle designed to operate on a drag strip accelerates from zero to 30 m/s while undergoing a straight line path displacement of 45 m. What is the vehicle's acceleration if its value may be assumed to be constant?

A bird, accelerating from rest at a constant rate, experiences a displacement of 28 m in 11 s. What is the final velocity after 11 s?

A bird, accelerating from rest at a constant rate, experiences a displacement of 28 m in 11 s. What is its acceleration?

A player releases a bowling ball from rest; it rolls down a ramp with constant acceleration. After half a second it has traveled 0.75 m. How far has it traveled after two seconds?

An automobile driver puts on the brakes and decelerates from 30.0 m/s to zero in 10.0 s. What distance does the car travel?

If the displacement of an object is given in SI units by delta x = -3 t + 4 t², at t = 2 s its velocity and acceleration are, respectively:

A rock is thrown straight down with an initial velocity of 14.5 m/s from a cliff. What is the rock's displacement after 2.0 s?

A rock is thrown straight up with an initial velocity of 24.5 m/s. What maximum height will the rock reach before starting to fall downward?

A rock is thrown straight up with an initial velocity of 19.6 m/s. What time interval elapses between the rock's being thrown and its return to the original launch point?

A baseball is released at rest from the top of the Washington Monument. It hits the ground after falling for 6.0 s. What was the height from which the ball was dropped? (ignore air resistance)

A rock, released at rest from the top of a tower, hits the ground after 1.5 s. What is the speed of the rock as it hits the ground?

A boy throws a rock down with speed 12 m/s from the top of a tower. The rock hits the ground after 2.0 s. What is the height of the tower?

At the top of a cliff 100 m high, a boy throws a rock upward with velocity 15.0 m/s. How much later should he drop a second rock from rest so both rocks arrive simultaneously at the bottom of the cliff?

A girl throws two stones from the top edge of a building with a speed of 20 m/s. She throws one straight down and the other straight up. The first one hits the street in a time t1. How much later is it before the second stone hits?

Mt. Everest is more than 8 000 m high. How fast would an object be moving if it could free fall to sea level after being released from an 8000-m elevation? (Ignore air resistance.)

A basketball player can jump 1.6 m off the hardwood floor. With what upward velocity did he leave the floor?

A water rocket, launched from the ground, rises vertically with acceleration of 30 m/s² for 1.0 s when it runs out of "fuel." Disregarding air resistance, how high will the rocket rise?

A parachutist jumps out of an airplane and accelerates with gravity to a maximum velocity of 58.8 m/s in 6.00 seconds. She then pulls the parachute cord and after a 4.00-second constant deceleration, descends at 10.0 m/s for 60.0 seconds, reaching the ground. From what height did the parachutist jump?

Starting from rest, a car accelerates down a straight road with constant acceleration a for a time t, then the direction of the acceleration is reversed, (i.e., it is -a), and the car comes to a stop in an additional time t, the time for the whole trip being 2t. At what time, or times, is the average velocity of the car for the trip equal to its instantaneous velocity during the trip?

In which of the following cases is the displacement's magnitude half the distance traveled?

A ball rolls down an incline, starting from rest. If the total time it takes to reach the end of the incline is T, how much time has elapsed when it is halfway down the incline?

Displacement is which of the following types of quantities?

Two students are working on the same constant acceleration problem involving a car undergoing constant acceleration, having started from rest and after a certain time having traveled a distance of 108 m. The students are to find the average velocity. Both students are required to show their work and round any intermediate answers as well as the final answer properly to 3 significant figures. Each rounded answer is to be used in the next step of calculation as they proceed. For the final answer, Student A uses the formula getting the result 7.26 m/s, and Student B uses the formula getting the result 7.29 m/s. Assuming neither student makes a mistake, which student has the better answer?

Two objects of different mass are released simultaneously from the top of a 20-m tower and fall to the ground. If air resistance is negligible, which statement best applies?

What happens to the horizontal velocity of a projectile as it travels along the curved path?

What happens to the vertical velocity of a projectile as it goes up?

What is the horizontal acceleration of a projectile?

A coin tossed vertically upward and it reaches the highest point in 7.0s. at the highest point, the velocity is _______.

The speed of a boat is often given in knots. If a speed of 5 knots were expressed in the SI system of units, the units would be:

How many significant figures does the number 1 700 have?

In the text are the following conversion factors:

i. 1 mi = 1 609 m

ii. 1 m = 39.37 in.

iii. 1 ft = 30.48 cm

iv. 1 in. = 2.54 cm

The 1 on the left hand side is assumed to have the same number of significant figures as the number on the right hand side of each of these equations. However, 2 of these conversion factors are exact, and this means they have the equivalent of an unlimited number of significant figures when used in calculations. Which 2 are the exact conversion factors?

A cereal box has the dimensions of 0.19 m x 0.28 m x 0.070 m. If there are 3.28 feet per meter, then what is the volume of the box in cubic feet?

A cement truck can pour 20 cubic yards of cement per hour. Express this in ft³/min.

The first displacement is 6 m, and the second displacement is 3 m. They cannot add together to give a total displacement of:

When three vectors are added graphically and form a closed triangle, the largest enclosed angle between any two of the vectors cannot be greater than:

An object, initially moving in the negative x-direction, is subjected to a change in velocity in the positive y-direction. If the resulting velocity vector is drawn from the origin, into which quadrant does this vector point?