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A 4.00 kg block is released from rest on a ramp that is inclined at an...

A 4.00 kg block is released from rest on a ramp that is inclined at an angle of 60.0∘ below the horizontal. The initial position of the block is a vertical distance of 2.00 m above the bottom of the ramp.

1) If the speed of the block is 5.00 m/s when it reaches the bottom of the ramp, what was the work done on it by the friction force?

3) How much work is done by friction when the ramp angle is 50.0∘?

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