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Q.

A ball is projected from the ground with speed 10 ms-1 at an angle 450 with horizontal. It collides with wall at a distance '4m' from the point of projection and returns to its original position. The coefficient of restitution between ball and wall is

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a

1/2

b

2/3

c

1

d

1/3

answer is B.

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Detailed Solution

Since the wall is smooth, vertical component of velocity of the ball after the impact remains unchanged and horizontal component of velocity after the impact becomes (e x 10 cos450) m/s.Now , tOAP + tPBO = T
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