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Constant forces F 1 and F 2 acting on a box as the box slides rightwards across a frictionless floor. F 1 = 2.0N is horizontal and leftward, and F 2 = 4.0N with angled upward of 60 o from the floor. The speed of the box at a certain instant is 3.0m/s. What is the power in W due to force F 1 acting on the box at that instant?