Question

What is the amount of work done by a weight-lifter in holding a weight of 100 kg on his shoulders for 40 s?

Answer 1

Step 1: Given data

Mass of weight, $m=100kg$

Time, $t=40s$

Since the weightlifter does not move, it can be said that displacement is $S=0$.

Step 2: Calculating work done

Work done is given by,

$W=FS$

Where, $F$ is force and $S$ is displacement.

Substituting the known values, we get,

$\begin{array}{l}W=F\times 0\\ W=0Joule\end{array}$

The amount of work done by a weight-lifter in holding a weight of 100 kg on his shoulders for 40 seconds will be zero as there is no net displacement.