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A steel ball of mass 0.80 kg rolls down a rough slope. It begins from rest at the top, and reaches a speed of 8.7 m/s at the bottom. What is the work done by friction and the average frictional force?
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A steel ball of mass 0.80 kg rolls down a rough slope. It begins from rest at the top, and reaches a speed of 8.7 m/s at the bottom. What is the work done by friction and the average frictional force?

User Hirumina
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the average frictional force is 7.24 N. The negative sign indicates that the force was acting in opposition to the motion of the ball.
User Regin Larsen
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