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A 12.0-kg block is pushed across a rough horizontal surface by a force that is angled...

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Physics

A 12.0-kg block is pushed across a rough horizontal surface by aforce that is angled 30.0â—¦ below the horizontal. The magnitude ofthe force is 75.0 N and the acceleration of the block as it ispushed is 3.20 m/s2 . What is the magnitude of the contact forceexerted on the block by the surface?

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