Question

please give me answer of this question

Answer 1

at height h ,it's final velocity will be 0.
as v=u-gt =>0=u-gt=>u=gt
so time taken to go up t1=u/g.
when the stone starts coming down it's initial velocity=0 and final velocity that was u
so u= 0+gt =>u=gt2,,,,so t2=u/g
so t1=t2,