Question

When a stone tied to a string is whirled in a circle, the work done on it by the string is

• A. Positive
• B. Negative
• C. Zero
• D. Undefined

Answer 1

The correct option is C Zero

As we know that work done is given as
$\Rightarrow W=FScos\theta$
So now, if we take the example of a stone tied to a string, then at each and every point displacement and tension are perpendicular to each other, then no work is done by the string on the stone.

Hence, option $\left(C\right)$ is correct.