A crate of 40.8-rm kg tools rests on a horizontal floor., Ask an Expert

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A crate of 40.8-{rm kg} tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it and observe that the crate just begins to move when your force exceeds 331 {rm N}. After that you must reduce your push to 212 {rm N} to keep it moving at a steady 20.7 {rm cm/s}.

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