If a stone of mass m is rotated in a vertical circular path of radius 1 m, the critical velocity will be
6.32 m/s
3.13 m/s
9.48 m/s
12.64 m/s
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A car of mass 800 kg moves on a circular track of radius 40 m. If the coefficient of friction is 0.5, then maximum velocity with which the car can move is