A ball falls from a height such that it strikes the floor of lift at 10 m/s.If lift is moving in the upward direction with a velocity 1 m/s, then velocity with which the ball rebounds after elastic collision will be?

If u do not know the formula for velocity after collision....it is the one I have mentioned here

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Apurva answered this

P.S. The formula is actually (m1 - m2) but if u notice the velocity one of them is negative with respect to the other. Here u1 is considered as negative.