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Applications of Newton’s second law

Problem

A warehouse worker applies a force F to accelerate two crates with the same mass, mA and mB, to the right along a rough floor.
Two crates of the same size sit side by side on a horizontal surface, in contact with one another. The crate on the left is labeled M sub A. The crate on the right is labeled M sub B. An arrow labeled F is to the left of box M sub A. The arrow points toward the right, touching the crate.
Which is the correct relationship between the applied force F acting on mA and the force mA exerts on mB?
Choose 1 answer:
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