A horizontal force of 12 N moves a box 3.0 m in the direction of the force. How much work is done by this force?
4.0 J4.0\ \mathrm{J}4.0 J
15 J15\ \mathrm{J}15 J
9.0 J9.0\ \mathrm{J}9.0 J
36 J36\ \mathrm{J}36 J