A stone tied with a string, is rotated in a vertical circle.

A stone tied with a string, is rotated in a vertical circle. The minimum speed with which the string has to be rotated

1. is independent of the mass of the stone
2. is independent of the length of the string
3. decreases with increasing mass of the stone
4. decreases with increasing length of the string

Minimum speed with which the string is rotating in a vertical circle (v) = √gr
The minimum speed of stone is independent of mass of stone.