Question

Q16. What will be the work done by the string, when a stone is tied to a string and whirled in a circle?

Answer 1

The work done will be zero because the direction of motion of the stone is towards the tangent drawn at the point which is directed towards the centre and makes an angle 90° since cos 90 is 0 work done is zero. Moreover after complete rotation the displacement is 0. Hence the work done is zero.