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Q.

A, B, C are points in a vertical line such that AB = BC. If a body falls freely from rest at A, t1 and t2 are times taken to travel distances AB and BC, then ratio (t2 / t1) is 

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a

22

b

2 -  1

c

12 - 1

d

2 + 1

answer is B.

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Detailed Solution

Let AB = BC = h

Then, t1 = 2hg

Time taken to travel from B to C, 

t2= tAC- tAB=tAC-t1

t2 = 4hg - 2hg⇒ t2t1=2-1

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A, B, C are points in a vertical line such that AB = BC. If a body falls freely from rest at A, t1 and t2 are times taken to travel distances AB and BC, then ratio (t2 / t1) is