Question

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

Answer 1

Step 1: Given Data

The weight lifted by the weight lifter, $w=100kg$

Duration of the weight lifted, $t=40sec$

Step 2: Calculating work done

Work done on an object is defined as the magnitude of the force multiplied by the distance moved by the object in the direction of the applied force.

Work done depends on force and displacement, $W=F\times S$

As there is no displacement (that is $S=0$) of the weight therefore no work is done.

Hence, the amount of work done by a weight lifter in holding a weight of 100 kg on his shoulder for 40 seconds is zero.