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Four guys are pushing a 225 kg piano up a ramp into a moving van, and...

Four guys are pushing a 225 kg piano up a ramp into a moving van, and they are pushing with 1200N. Assume no friction. What is the final speed of the ramp is distance=3.5m and height is 1.2 m?

Assume the same piano above, but this time there is friction, so the piano moves at a constant speed up the ramp at 20 degree angle, what is the coefficient of the friction?

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