Question

A person lifts a 10 N box 1 m off the ground in 1 s. How much power does she use? P = W/t

Answer 1

Answer:

C. 10 W.

Explanation:

Hello!

In this case, since the power the person uses to lift the 10-N load is computed by using the formula:

$P=\frac{W}{t}$

Whereas W is the work and t the time; we can compute the work by multiplying the force applied in 1 m:

$W=10N*1m=10J$

Now, we divide it by the time to obtain:

$P=\frac{10J}{1s}=10W$

Since joules over seconds are watts.

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