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Q.

A body of mass 3 kg is moving along a straight line with a velocity of24ms−1 . When it is at a point 'P' a force of 9 N acts on the body in a direction opposite to its motion. The time after which it will be at 'P' again is,

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a

8s

b

16s

c

12s

d

24s

answer is B.

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Detailed Solution

When it reaches the point ‘P’ again s=0 ut−12at2=0⇒t=2ua a=fm ∴t=2ufm=2×2493=16s
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