Question

A stone of mass m tied to the end of a string revolves in a vertical circle of radius R. The net forces at the lowest and highest points of the circle directed vertically downwards are : [Choose the correct alternative]

T₁ and v₁ denote the tension and speed at the lowest point. T₂ and v₂ denote corresponding values at the highest point.

Answer 1

The net force acting on stone at the lowest point directed vertically downward = mg – T₁ & and the highest point = mg + T₂. Hence option (a) is correct answer.