A system is shown in the figure .Which is released from rest. There is no friction between ground and mass 5m. The coefficient of friction between mass 5m and mass 2m is $μ$ . The coefficient of friction between mass 5m and mass m is also $μ$ . Choose the correct option(s).

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The tension in the string is $\frac{4 m g}{3 \sqrt{3}}$ if $μ = \frac{1}{\sqrt{3}}$

The magnitude of acceleration of mass 5m is zero if $μ = \frac{1}{\sqrt{3}}$

The acceleration of centre of mass of system is zero.

The magnitude of acceleration of mass 5m is zero if $μ = 0$

answer is B, C, D.

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