Question

When the force applied and the displacement of the body are inclined at $90°$ with each other, the work done is

• A. infinite
• B. maximum
• C. $0$
• D. unity

Answer 1

The correct option is C

$0$

Step 1: We have

Here the force is perpendicular to the displacement.

So, the angle between force and displacement, $\theta =90°$

Step 2: To calculate the work done

We know that

Work done, $W=Fd\cos \theta$

$W=Fd\cos 90°$

$W=Fd\left(0\right)[\cos 90°=0]$

So, work done is zero

Hence, option C is correct.