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A steel ball falling vertically strikes a fixed rigid plate A with velocity v0 and rebounds horizontally as shown. Assuming

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A steel ball falling vertically strikes a fixed rigid plate A with velocity v0 and rebounds horizontally as shown. Assuming surface to be same and the effect of gravity on motion of ball to be neglected. If the coeficient of the restitution for the ball is 'e' then the value of 1/e is :

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V0 sin30° = V1 cos30° (i) 

eV0 cos30° = V1 sin30° (ii)

Dividing (i) & (ii)

1/e tan 30° = 1/tan 30° 1/e = 3

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