A plank of mass 3m is placed on a rough ...

A plank of mass 3m is placed on a rough inclined plane and a man of mass m walks down the board. If the coefficient of friction between the board and inclined plane is `mu = 0.5`, the minimum acceleration of does not slide is:

`8 m//s^(2)`

`4 m//s^(2)`

`6 m//s^(2)`

`3 m//s^(2)`

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