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The cable of an electric motor exerts a force of 30 N on a body and pulls it through a distance of 20 m in one minute. What is the power of the motor?

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30 W

12 W

20 W

10 W

answer is A.

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Detailed Solution

Power = Work/Time

Given, F = 30 N

s = 20 m

t = 1 minute = 60 s

Work = force × displacement

∴ Work = 30 × 20 = 600 J

Power = work/ time = 600/60 = 10 W

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