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Q.

Two bodies, A (of mass 1kg) and B (of mass 3kg) are dropped from heights of 16 m and 25 m, respectively. The ratio of the time taken by them to reach the ground is:

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a

5/4

b

12/5

c

5/12

d

4/5

answer is D.

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Detailed Solution

For free fall from a height u=0 (initial velocity) By second equation of motion,
h=ut+12gt2=0+12gt2  ⇒h1h2=t1t22
Given, h1 = 16 m, h1 = 25 m
∴t1t2=h1h2=1625=45

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