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Assume there is a coefficient of friction µk = 0.2 between the crate and the incline in the figure below. What magnitude of force must be applied to the 50.0 kg crate on the plane inclined at 30◦ to cause an acceleration of 1.6 m/s2 up the plane?
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重力势能是物体由于在重力场中的位置而具有的能量
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