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An object, which is initially at rest on a frictionless horizontal surface, is acted upon by four constant forces. F1 is 28.6 N acting due East, F2 is 41.2 N acting due North, F3 is 47.8 N acting due West, and F4 is 10.8 N acting due South. How much total work is done on the object in 3.33 seconds, if it has a mass of 20.0 kg?

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