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An electric motor exerts a force of $40 \mathrm{~N}$ on a cable and pulls it by a distance of $30 \mathrm{~m}$ in one minute. The power supplied by the motor (in Watts) is
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20
$P=F v=F \times \frac{s}{t}=40 \times \frac{30}{60}=20 \mathrm{~W}$
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