Question

A man starts walking from a point on the surface of earth (assumed smooth) and reaches diagonally opposite point. What is the work done by him:

• A. Zero
• B. Positive
• C. Negative
• D. Nothing can be said

Answer 1

The correct option is A Zero

A man starts walking from a point on the surface of earth and reaches diagonally opposite point, then the work is done by gravity and then work done is zero. Here, the direction of motion is perpendicular to the force of gravity.

$\because workdone=Fds\cos \theta$

$here,\theta ={90}^0$

$W=0$