Question

A small body of mass 'm' hangs at one end of a string of length 'a', the other end of which is fixed. It is given a horizontal velocity 'u' at it's lowest position so that the string would just become slack, when it makes an angle of 60 degrees with the upward drawn vertical line. Find the tension in the string at point of projection

Answer 1

Balancing force in eqn 1 and balancing energy in eqn 2