A block of mass m=1kg has a speed v = 4 ...

A block of mass `m=1`kg has a speed `v = 4 m//s` at `theta = 60^(@)` on a circular track of radius R = 2 m as shown in figure. Size of the block is negligible. Coefficient of friction between block and the track is `mu = 0.5`. The force of friction between the two is

10 N

8.5 N

6.5 N

5 N

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