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  4. A boy having a mass of 60 kg, holds in hand a school bag of weight 40 N. With what force the floor will push up on his feet ? (g=10 m / s 2)

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Q. A boy having a mass of $60\, kg$, holds in hand a school bag of weight $40 \,N$. With what force the floor will push up on his feet ? $\left(g=10\, m / s ^{2}\right)$

AMUAMU 2002

Solution:

Total force acting on boy bag system, is given by
image
$F =$ weight of boy $+$ weight of bag
$F =60 \,g +40 \,N $
$\Rightarrow F =60 \times 10+40=640 N$
From Newton's third law, to every action there is an equal and opposite reaction.
Therefore, the floor will push on his feet with a force of $640\, N$.