5. A person pushes a desk across the horizontal floor with a constant force of 20 N. The desk moves at a constant 2 m/s. If the only other force on the desk is friction force, how does the friction force compare to the amount of force the person applies? a. The force of friction is greater than the applied force. c. The force of friction is equal to the applied force. b. The force of friction is less than the applied force. d. The force of friction is zero.
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