Question 1

A stunt driver drives a car off a cliff at a velocity of 20m/s. He lands in the lake below 2 seconds later. Find the height of the cliff. What are the GIVENS for this question?

Accepted Answer

v_ix=20m/s; v_iy=0m/s; t=2 sec; a_y=-9.8m/s²

Answer

v_ix=20m/s; v_iy=2m/s; t=20 sec; a_y=-9.8m/s²

Answer

v_ix=0m/s; v_iy=20m/s; t=2 sec; a_y=9.8m/s²

Answer

v_ix=2m/s; v_iy=0m/s; t=20 sec; a_y=9.8m/s²

Question 2

A stunt driver drives a car off a cliff at a velocity of 20m/s. He lands in the lake below 2 seconds later. Find the height of the cliff. What is the UNKNOWN for this question?

Accepted Answer

<math>\Delta x</math>

Answer

time

Answer

range

Answer

acceleration

Question 3

A stunt driver drives a car off a cliff at a velocity of 20m/s. He lands in the lake below 2 seconds later. Find the height of the cliff. What is the EQUATION for this question?

Accepted Answer

<math>\Delta x=\left(v_i	imes tight)\ +\frac{1}{2}at^2</math>

Answer

v_f=v_i+ a_yt

Answer

<math>\Delta x=vi^2\ +\ 2a\Delta y</math>

Answer

<math>\Delta x=v_{ix}\ t</math>

Question 4

A stunt driver drives a car off a cliff at a velocity of 20m/s. He lands in the lake below 2 seconds later. Find the height of the cliff. What is the SUBSTITUTION AND SOLUTION for this question?

Accepted Answer

$\Delta x$ =-19.6m

Answer

<math>\Delta x\ =\left(0\ \frac{m}{s\ }\ x\ -9.8\ \frac{m}{s^2}\right)\ \ x\ 2^2\sec=39.2\ m</math>

Answer

<math>\Delta x=20\ \frac{m}{s}	imes2\ s\ =40\ \frac{m}{s}</math>

Answer

<math>\Delta x=\frac{\left(0\ \frac{m}{s\ }+20\ \frac{m}{s}ight)}{2}\ 	imes2\ =20\ m</math>

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