Question

A particle is moving in a circular path of radius (r). The displacement after half a circle would be

Suppose a boy is enjoying a ride on a merry-go-round which is moving with a constant speed of 10 m s⁻¹. It implies that the boy is

A boy is whirling a stone tied with a string in an horizontal circular path. If the string breaks, the stone

Suppose gravity of earth suddenly becomes zero, then in which direction will the moon begin to move if no other celestial body affects it?