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A rubber ball dropped from a height of 80m $(g = 10 m / s^{2})$ falls on the roof of an elevator going up at 2 m/s. If the collision of the ball with the elevator is elastic, the ball rebounds with a velocity of

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detailed solution

Correct option is B

v1=(m1−m2m1+m2)u1+2m2u2m1+m2 u=2gh=2×10×80 =1600 u1=40 v1=−u1+2u2 =−40+2(−2) =−44m/s

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A rubber ball dropped from a height of 80m (g=10m/s2) falls on the roof of an elevator going up at 2 m/s. If the collision of the ball with the elevator is elastic, the ball rebounds with a velocity of

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Ready to Test Your Skills?

free study material

A rubber ball dropped from a height of 80m $(g = 10 m / s^{2})$ falls on the roof of an elevator going up at 2 m/s. If the collision of the ball with the elevator is elastic, the ball rebounds with a velocity of