A block of mass m is kept on an inclined...

A block of mass m is kept on an inclined plane of a lift moving down with accelration of `2m//s^(2)` .what should be the coefficient of friction for the block to move down with constant velocity relative relative to lift?

`mu=(1)/(sqrt3)`

`mu=0.4`

`mu=0.8`

`mu=0.5`

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