Question

150 W of power was used to move an object 22 meters with 15N of force. How long did it take ?

Answer 1

The work done in this case is:

$$A = Fs$$

where $F = 15N$ is acting force and $s = 22m$ is the distance covered under this force. Thus, obtain:

By definition, the power is:

$$P = \dfrac{A}{t}$$

where $t$ is the time of the process. Expressing $t$, get:

$$t = \dfrac{A}{P} = \dfrac{Fs}{P} = \dfrac{15N\cdot 22m}{150W} = 2.2s$$

Answer. 2.2 s.