A block of mass 1 kg starts slipping on a circular track of radius 2m and it is observed that when Q=60° its speed is 4 m/ s as shown in figure . Assuming size of block to be negligible and coefficient of friction between block and track is 0.5 frictional force on block when Q= 60°is
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as it is 1 kg it should be 4900 gn 3 is
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