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Question

A force is applied on a body of mass 20 kg moving with a velocity of 40 m/s. The body attains a velocity of 50 m/s in 2 seconds. Calculate the work done by the body.

A
900 J
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B
9000 J
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C
18000 J
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D
1800 J
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Solution

The correct option is B 9000 J
We have the initial velocity u=40 m/s and final velocity v=50 m/s

Using work energy theorem
Work done by the force (W) = Change in kinetic energy

W=12mv212mu2
W=12×20(502402)
=10×(502402)
=10×900
W=9000 J

Hence option B is the correct answer

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