A 20.0 N force is applied at an angle of 40.0 degrees below the horizontal to a 4.00 kg box. The box moves a horizontal distance of 4.00 metres. The work done by the 20.0 N force is:

(Force component along direction of motion) x (distance)

= 20.0 cos 40 * 4.00 = ___ J

The box's mass does not matter in the computation.