Question

If you lift a box using a 100 J of work within 5 s, how much power has been done? How much is the power if it’s lifted using a 10 J of work?

Answer 1

(a)

$$P=\dfrac{W}{t}=\dfrac{100\ J}{5\ s}=20\ W.$$

(b)

$$P=\dfrac{W}{t}=\dfrac{10\ J}{5\ s}=2\ W.$$