The Total solution for NCERT class 6-12
If,in Exercise 5.21, the speed of the stone is increased beyond the maximumpermissible value, and the string breaks suddenly, which of the followingcorrectly describes the trajectory of the stone after the string breaks:
(a)the stone moves radially outwards,
(b)the stone flies off tangentially from the instant the string breaks,
(c)the stone flies off at an angle with the tangent whose magnitude depends on thespeed of the particle ?
Answer: (b)
Whenthe string breaks, the stone will move in the direction of the velocity at thatinstant. According to the first law of motion, the direction of velocity vectoris tangential to the path of the stone at that instant. Hence, the stone willfly off tangentially from the instant the string breaks.