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A block of mass 5.0kg slides down from t...

A block of mass `5.0kg` slides down from the top of an inclined plane of length `3m`. The first `1m` of the plane is smooth and the next `2m` is rough. The block is released from rest and again comes to rest at the bottom of the plane. If the plane is inclined at `30^@` with the horizontal, find the coefficient of friction on the rough portion.

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