as there are 11 drops there are 10 time intervals
total time =root 2h/g = root 2x250/g =5 sec
so each time interval=5/10=1/2sec
now the distance travelled by 10th drop ; h of 10th drop=1/2gt2=1/2 x g x( 1/2)2 = 1.25m
answer will be 4g/3 do it
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