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Work Energy Theorem

The power req...

Question

The power required by a force $F$ to keep the car of mass $m$ moving with constant velocity $v$ against frictional force is:

A

F s

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B

F v

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C

0

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D

1 / 2 m v^{2}

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Solution

The correct option is B $F v$
Power required by external force $F, P = F \times s / t = F v$

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