A man in a lift which is ascending with an upward acceleration 'a' throws a ball vertically upwards with a velocity ‘v’ with respect to himself and catches it after ‘t 1 ’ seconds. Afterwards when the lift is descending with the same acceleration 'a' acting downwards the man again throws the ball vertically upwards with the same velocity with respect to him and catches it after ‘t 2 ’ seconds
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(a,c,d) For first case (when lift is ascending with an acceleration a)
t 1 = 
...........(i)
for second case (when lift is descending with an acceleration a )
t 2 = 
...........(ii)
on solving equation (i) and (ii) we get
V = 
& a = g 
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