A student pushes a heavy box across a rough floor. The box moves at a constant velocity. Which of the following statements BEST describes the forces acting on the box?
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A
The force of the push is greater than the force of friction.
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B
The force of friction is equal to the force of the push.
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C
The force of gravity is greater than the force of the push.
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D
The net force on the box is in the direction of motion.