aboy having a mass of 75 kg holds in his hands a bag of flour weighing 40N with what force does the floor Push up on his feet ?​

40 newtons

Explanation:

It will be equal to the amount of force pushing down because otherwise he'd just fall through the floor.

Heres newtons law for the principle

Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object.

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

the answer is a 3.8cm

explanation: