A ball of mass 0.4 kg moving with a uniform speed of 2ms^(-1) strikes normally a wall and rebounds. Assuming the collision to be elastic and the time of contact of the ball with the wall as 0.4s, find the force exerted on the ball.

A ball of mass 0.4 kg moving with a uniform speed of 2ms^(-1) strikes

1.	A ball of mass 0.4 kg moving with a uniform speed of 2ms^(-1) strikes normally a wall and rebounds. Assuming the collision to be elastic and the time of contact of the ball with the wall as 0.4s, find the force exerted on the ball.
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