'Cos 60o' presentation slideshows

Try this problem

Try this problem. Five forces act on an object: the first, 60 N at 90 degrees; the second 40 N at 0 degrees; the third 80 N at 270 degrees; the forth 40 N at 180 degrees; the fifth 50 N at 60 degrees. What is the magnitude and direction of a sixth force that produces equilibrium of the object?.

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