Work, Energy and Power (Quiz)

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Q.1 A block of mass 5.0 kg 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 300 with the horizontal, find the coefficient of friction on the rough portion .