an object, which is initially at rest on a frictionless horizontal surface, is acted upon by four constant forces. ????1 is 14.6 n acting due east, ????2 is 37.0 n acting due north, ????3 is 47.8 n acting due west, and ????4 is 17.4 n acting due south. how much total work is done on the object in 3.33 s, if it has a mass of 12.0 kg ?