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4e.9 A 10-kg box is moving across the frictionless floor by a 100-N pulling force F1, directed at 36.90 above the horizontal, and a 20-N
4e.9 A 10-kg box is moving across the frictionless floor by a 100-N pulling force F1, directed at 36.90 above the horizontal, and a 20-N backward pulling force F2, directed at 30.0 above the horizontal. A 3'd pulling force F3 is added to the left to make the box moving with constant velocity. What is the magnitude of the force F3? [Answer: 62.7 N]
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