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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...

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

B

200

C

2

D

10

Answer

20

Explanation

Solution

P = Fv =F×st=40×3060=20 W= F \times \frac { s } { t } = 40 \times \frac { 30 } { 60 } = 20 \mathrm {~W}