A pulley is connected to the ceiling of ...

A pulley is connected to the ceiling of an elevator by a massless rod. Two masses are connected as shown in figure. There is sufficient friction in the pulley axis. The acceleration of block w.r.t. earth is

`(4g)/(7)` (upward)

`(3g)/(7)` (upward)

`(2g)/(7)` (upward)

`(g)/(7)` (upward)

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