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A plank of mass M(1)=8kg with a bar of ...

A plank of mass M_(1)=8kg with a bar of mass M_(2)=2kg placed on its rough surface,lie on a smooth floor of elevator ascending with an acceleration g/4.The coefficient of friction is mu=1/5 between M_(1) and M_(2).A horizontal force F=30N is applied to the plank.Then the acceleration of bar and the plank in the reference frame of elevator are:

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