Question

If an engine does 400 J of work in 10 s, how much power was generated?A. 40 WB. 400 WC. 4 WD. 4000 W

Answer 1

Given:

The work is

$W=400\text{ J}$

The time is

$t=10\text{ s}$

To find:

The power generated

Explanation:

The power is,

$\begin{gathered} P=\frac{W}{t} \\ =\frac{400}{10} \\ =40\text{ W} \end{gathered}$

Hence, the power is 40 W.