The friction force retarding the motion is 80 n how large


A horizontal force P is exerted on a 20-kg box to slide it up a 30 degrees incline. The friction force retarding the motion is 80 N. How large must P be if the acceleration of the moving box is to (a)zero and (b) 0.75m/s2?

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Physics: The friction force retarding the motion is 80 n how large
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