A person having a mass of 60 kg exerts horizontal force of 200 N in pushing a 90-kg object a distance of 6 metres of 6 meters along a horizontal floor. He does this at constant velocity in 3 seconds. The force of friction is

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A person having a mass of 60 kg exerts horizontal force of 200 N in pushing a 90-kg object a distance of 6 metres of 6 meters along a horizontal floor. He does this at constant velocity in 3 seconds. The force of friction is






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