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A force F is required to push a crate along a rough horizontal floor at a...

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 the crate along the same floor at a constant speed 2V if friction is the same as before?

1) A force that gradually increases from F to 2F is needed.

2) No force is needed since the crate has no acceleration.

3) A constant force 2F is needed.

4) A constant force F is needed.

5) A constant force 1/2F is needed.

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