If the speed of stone is increased beyond the maximum permissible value and the string breaks
suddenly, which of the following correctly describes the trajectory of the stone after the string breaks
(i) the stone moves radially outwards,
(ii) the stone flies off tangentially from the instant the string breaks,
(iii) the stone flies off at an angle with the tangent
whose magnitude depends on the speed of the particle?
The second part correctly describes the trajectory of the stone after the spring breaks because when a stone tied to one end of a string is whirled round in a circle then velocity of the stone at any point is along the tangent at that point. If the string breaks suddenly, then stone flies off tangentially, along the direction of its velocity.