Question

A boy whose mass is 75 kg holds in his hands a bag weighing 40 N. With what force does the floor push up on his feet?

Answer 1

N=mass x gravity, N=75 x 10 , N=750 N, bag has a force of 40N, so N=750+40=790N.

Force on its feet is the force of gravity.but on the bag is W=mg , W=F (same units)F=mg, F=75×10, F=750N.

It is holding by applying a force to the ground and carry out the planet called Mass of the man taken by 60kg.

Answer 2

Answer:

With 628 N force the floor push up on his feet.

Explanation:

The force due to the mass of the boy=

$=75×9.8 \\ =588N$

Again force due to the bag=40N

Total action force exerted on the

ground=

$588+40 \\ =628N$

If the boy stands on the floor then there isno other

force acting on the floor.

We know by Newton's third law every action has equal and opposite reaction.

So,by newton's 3rd law action=-Reaction.

So, Reaction force exerted by floor on the boy would be 628 N opposite to the action force.

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