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The figure here shows two horizontal for...

The figure here shows two horizontal forces acting on a block on a frictionless floor. If a third horizontal force `vec(F)_(3)` also acts on the block, what are the magnitude and direction of `vec(F)_(3)` when the block is (a) stationary and (b) moving to the left with a constant speed of `5" m"//"s"` ?

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(a) and (b) 2 N, leftward (acceleration is zero in each situation)
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