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Power, Force and Velocity

An electric m...

Question

An electric motor exerts a force of 40 N on a cable and pulls it by a distance of 30 m in one minute. The power supplied by the motor (in Watts) is

A

20

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B

200

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C

2

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D

10

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Solution

The correct option is A
20

$P = F v = F \times \frac{s}{t} = 40 \times \frac{30}{60} = 20 W$

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