Question

A person carrying a load on his head and standing at a given place does

• A. Minimum work
• B. Maximum work
• C. No work
• D. Infinite work

Answer 1

The correct option is C

No work

We know that work done,$W=FS\cos \theta$

where $F=$ force applied; $S=$displacement and $\theta =$gradient between the direction of the force and the displacement of the body.

Since the person carrying the load in his head and standing so the angle is ${90}^{\circ }$because the person moves horizontal and the gravitational force is vertical.

So, as $\theta ={90}^{\circ }thenCos\theta =0$

$$\begin{gathered} \therefore W=FS\times \left(0\right) \\ W=0 \end{gathered}$$

Thus, work done is zero or no work is done.

Hence, option (c) is correct.