Question

A force of 70 newtons must be exerted to keep a car moving with a constant speed of 10 meters per second. What is the rate at which energy must be supplied?
A.
7.0 W
B.
700 W
C.
0.1 W
D.
7000 W

Answer 1

The rate at which energy must be supplied to the car is 700 W.

Instantaneous power

The instantaneous of an object is the rate at which energy is supplied at a given period of time.

P = Fv

where;

• P is the instantaneous power
• F is applied force
• v is the speed

The rate at which energy must be supplied to the car is calculated as follows;

P = 70 x 10

P = 700 W

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