Write the C.G.S unit of force.

Assertion- The average speed of an object may be equal to the arithmetic mean of individual speed

Reason-Average speed is equal to the total distance traveled divided by the total time taken.

When a ball is dropped from a height, its speed increases gradually. Name the force which causes this change in speed.

A feather of mass 10kg is dropped from a height. It is found to fall down with constant velocity. What is the net force acting on it?

When the distance travelled by a body is directly proportional to the square of time taken,the motion of the body is

A moving train is brought to rest within 20 seconds by applying brakes. If the retardation due to brakes is 2m/s2 then the initial velocity was:-

"The sparks produced during the sharpening of the razor against the grinding wheel leave the rim of the wheel tangentially" is an example of which type of inertia?

A person is standing in an elevator.In which situation he finds his weight less than actual when

A body of mass m kg starts from rest and travels a distance of s m in t seconds. The force acting on it is:-

During a football match, the ball shot towards the goal struck the defender's foot at the speed of 10 m/s, and bounces back at 20m/s.If the time of impact was 0.2sand the massif the ball is 1/2 kg, then the average force exerted by a defender on the ball is