Question

a body is tied to one end of a light in extensible string and moving in a vertical circle.

Answer 1

Answer:

here is your answer

Explanation:

At any time force acting on particle vary and hence acceleration (net) will have different direction at different times. Tension also changes and its minimum at top point. Magnitude of acceleration also varies.

Considering earth and particle as a system and no external force on system is acting, total mechanical energy will be conserved.