Acube of mass m1=7.6 kg is sitting on top of a second cube of the same size and mass m2=1.3 kg while both are in free fall. ignoring any air resistance, what is the magnitude of the normal force with which the bottom cube is acting on the top cube?

Zero

Explanation:

To solve the problem, we just need to analyze the forces acting on the top cube.

There are two forces acting on it:

- The force of gravity (the weight of the cube), downward, which is

where

is the mass of the cube

is the acceleration of gravity

- The normal reaction exerted by the bottom cube on the top cube, upward, which we indicate with R

So, the equation of the forces for the top cube is

where

is the acceleration of the cube, since it is in free fall

Solving for R, we find:

50 inches should be the resultant vector

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