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5. A 4kg box sits on a 7kg box which sits on 10kg box. 10kg box rests on a tabletop. What is the normal force

5. A 4kg box sits on a 7kg box which sits on 10kg box. 10kg box rests on a tabletop. What is the normal force exerted on the 7kg box by the 10kg box? a) 39.2N b) 107.8N c) 68.6N d) 205.8N

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