physics multiple choice

A force F is required to push a crate along a rough horizontal floor at a constant speed V with friction present.

What force is needed to push this crate along the same floor at a constant speed 3V if friction is the same as before?

A. A constant force 3F is needed.
B. A force that gradually increases from F to 3F is needed.
C. A constant force F is needed.
D. No force is needed, since the crate has no acceleration.

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