Question

two balls are dropped from height h and 2h respectively from the earth surface.the ratio of time of these balls to reach the earth is.

Answer 1

Hello 
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time taken by ball  A = √(2h/g) 
time taken by ball B  = √(4h/g )

RATIO = √(2h/g) / √(4h/g)
            = 2h/g / 4h/g 
            = 2h/4h
            = 2/4 
            = 1/2 

Answer 2

The answer is 1/ √2

Hope u understand