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A body does 20 joules of work in 5 seconds. What is its power ?

Solution

Power is calculated by using the formula:

$$\text { Power }=\frac{\text { Work done }}{\text { Time taken }}$$

Here, Work done $=20 \mathrm{~J}$

And, Time taken $=5 \mathrm{~s}$

So, putting these values in the above formula, we get:

\begin{aligned} \text { Power } &=\frac{20 \mathrm{~J}}{5 \mathrm{~s}} \\ &=4 \mathrm{~J} / \mathrm{s} \\ \text { Power } &=4 \mathrm{~W} \end{aligned}

(because $1 \mathrm{~J} / \mathrm{s}=1 \mathrm{~W}$ )

Thus,the power of this body is 4 watts.

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