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A box moves across a rough ?oor with a constant velocity when a force is applied....

A box moves across a rough ?oor with a constant velocity when a force is applied. In the ?rst case, the force FA acts on the box at an angle of 30° below the horizontal. In the second case, the force FB acts on the box at an angle of 30° above the horizontal. How do these forces compare?
A)FA = FB
B)FA <FB
C)FA > FB
D)FA - FB = mg

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