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Q.

Time taken by an object falling from rest to cover the heights of h1 and h2 are respectively t1 and t2 . Then the ratio of t1 to t2  is        

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a

2h1:h2

b

h1:h2

c

h1:h2

d

h1:2h1

answer is B.

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Detailed Solution

Initial velocity u = 0

S=ut+12at2S=12at2Sαt2

h1h2=t12t22t1t2=h1h2

t1:t2=h1:h2

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