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Q.

A girl throws a ball with initial velocity v at an inclination of 45°. The ball strikes a smooth vertical wall at a horizontal distance d from the girl and after rebouncing returns to her hand. The coefficient of restitution between the wall and the ball is kgdv2−gd where ‘k’ is ____

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answer is 1.

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Detailed Solution

T=d(v/2)+d(ev/2)=1+1e2dv

 where T=2Vsin⁡45∘g

2v/2g=1+1e2dv⇒e=gdv2−gd

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