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In the system shown in the figure the ma...

In the system shown in the figure the mass `m` moves in a circular arc of angular amplitude `60^@`. Mass `4 m` is stationary. Then :
.

A

The minimum value of coefficient of friction between the mass 4 m and the surface of table is 0.5

B

The work done by gravitation force on the block m is positive when it moves from A to B

C

The power delivered by the tension when m moves from A to B is non-zero

D

The kinetic energy of m in position B equals the work done by gravitational force on the block when the moves from position A to position B.

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