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Work Energy Theorem

A body of mas...

Question

A body of mass 44 kg is moving at a velocity of 10 m/s is brought to rest in 10mins, the work done is:

A

220 J

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B

-2200J

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C

22 J

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D

22000 J

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Solution

The correct option is B
-2200J

Work done is given as change in kinetic energy of the body.

W = ½ m (v²-u²)

W= ½ mv²- ½ mu²

= 0 – ½ × 44 × 10²

= - 2200

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