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You have a stack of boxes on a flat surface. The bottom box has a mass equal to $M$. The middle box has a mass equal to $2M$. The top box has a mass equal to $3M$.

Created for Albert.io. Copyright 2016. All rights reserved.

Which of the following statements is true according to Newton's third law? Choose TWO answers.

A

The force of the floor pushing upward on the bottom block equals the sum of the force of gravity acting on the three boxes.

B

The normal force exerted upward by a bottom box equals the normal force exerted downward by a box immediately on top of it.

C

The normal force acting exerted upward on the middle block by the bottom block equals the force of gravity pulling down on the middle block.

D

The pull of gravity on the top block by the Earth equals the upward pull exerted on the Earth by the top block.

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