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A 20.0-kg block slides down along a 30 degree incline from a height of 20.0m,
(a) if the block reaches the bottom of the slope at 12.0 m/s, what is the average frictional force between the block and the surface of the slope?
b) what is the kinetic coefficient of friction of the block on the slope?
(c) after reaching the bottom of the slope, the block continues to slide on the level ground for 30.0 m before stopping, what is the kinetic coefficient of friction between the level ground and the block?
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A person of mass 75 kg stands at the center of a rotatingmerry-go-round platform of radius 2.6 m and moment of inertia 1500 kg·m2. The platformrotates without friction with angular velocity 2.0 rad/s. The person walks radially to the edge of the p..
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