A worker applies force to a wheeled cart on a level floor. The cart moves at a constant velocity as long as the worker continues to apply force. What conclusion can be reached about friction between the cart and the floor?
A
It is zero as long as the cart is moving at a constant velocity.
B
It is positive until the cart is in motion, but is zero when the cart is in motion.
C
It is equal in magnitude to the worker’s force, but opposite in direction.
D
It is equal in magnitude to the worker’s force, and has the same direction.
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