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First Law of Motion

A man of mass...

Question

A man of mass 60 Kg is standing on the floor holding a stone weighing 40N. What is the force with which the floor is pushing him up?(g=10 ${m s}^{- 2}$ )

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Solution

Weight of man = 60x10=600N

Total force exerted by the feet of the man on the ground= 600+40=640N

According to Newton’s third law, as feet of man exert 640N on floor, floor in turn exerts equal force on the man.

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