Three separate forces act on an object. The gravitational force, Fg, acts downward with a magnitude

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Three separate forces act on an object. The gravitational force, Fg, acts downward with a magnitude of 325 N. F1 = 310 N acts at 120° and F2 acts at an angle of 20°. (a) What is the mass of the object? b) What should the magnitude of F2 be if the object undergoes no acceleration?
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