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Q.

A body of mass 1 kg is moving along positive x-axis with velocity 2 m/s. At t = 0, a constant force, parallel to positive y-axis, starts acting on the body and after 5 sec, speed of the body is found to be 4 m/s. Then work done by the force in 5 sec is

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a

12 J

b

6 J

c

16 J

d

10 J

answer is B.

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Detailed Solution

By work – energy theoremW=KEf−KEi=12  ×1  ×  42   −  12  ×1  ×  22   joule = 6 J
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A body of mass 1 kg is moving along positive x-axis with velocity 2 m/s. At t = 0, a constant force, parallel to positive y-axis, starts acting on the body and after 5 sec, speed of the body is found to be 4 m/s. Then work done by the force in 5 sec is