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Q.

A stone is dropped freely, while another thrown vertically downward with an initial velocity of 2 ms-1 from the same point, simultaneously. The time required by them to have a distance of separation 22 m between them is

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a

22s

b

11s

c

44s

d

5.5s

answer is A.

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Detailed Solution

Initial relative velocity is = 2m/s - 0 m/s = 2m/s

Relative acceleration is 

arl=0S = ut⇒t=Sut=222=11

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