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A 4-kg object is moved along a rough surface inclined at 15 downward at a...

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Physics

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A 4-kg object is moved along a rough surface inclined at 15 downward at a constant speed as the result of the applied horizontal force. The coefficient of kinetic friction between the surface and the object is 0.25. Find a) the magnitude of the applied force. b) What is the magnitude of the applied force F for the object to move up with acceleration 2 m/s^2.

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