A box of mass m = 7.5 kg is pulled across a frictionless surface by a constant force F with magnitude F = 21 N that makes an angle 0 = 150 with respect to the horizontal. TIL m (a): 5 points How much work is done by the force if it drags the box a distance of d = 1.5 m? (b): 5 points If the box starts at rest, what is the speed of the box after it has been dragged a distance of d = 1.5 m