Question

A particle is thrown up inside a stationary lift of sufficient height. The time of flight is T. Now it is thrown again with same initial speed v0 with respect to lift. At the time of second throw, lift is moving up with speed v0 and uniform acceleration g upward (the acceleration due to gravity). The new time of flight is–
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Answer 1

Answers:time of flight for first throw is given by T=g2v

but in second case v is same but relative acceleration of ball  wrt to the lift 2g   i.e.(g+g). so time of flight will reduce to half that of first one.