1.

a body is falling from height H it takes t1 time to reach the ground . The time taken to cover the first half of the height is

Answer»

We know that,

t =  [2H/g]½

T1 =  (2H/g)½

according to QUESTION 

t2 = (H/g)½ 

now MULTIPLY and DEVIDE by 2½ to t2

we get t2 = t1/(2)½



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