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

A. 100 W
B. 20 W
O C. 10 w
O D. 12 W

Answer 1

C. 10 W.

Step-by-step explanation:

Hello!

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

`P=(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=(10J)/(1s)=10W`

Since joules over seconds are watts.

Best regards!