A ball falls from a height such that it strikes the floor of lift at 1
with a velocity 1 m/s, then velocity with which the ball rebounds
(1) 11 m/s
(2) 12 m/s
(3) 13 m/s
(4) 9 m/s
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Relative velocity of ball w.r.t lift =10+1=11m/s.
Collision is elastic therefore ball rebound with velocity relative to lift=11m/s.
But the velocity w.r.t ground=11+1=12m/s.
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