A canal barge is pulled along a straight canal of length 1.2 km by a horse walking along the towpath. The towrope is inclined at an angle of 25∘ 25^\circ\,25∘ to the direction of motion of the barge, as shown in the diagram below.
The tension in the towrope is constant at 450 N. What is the work done by the tension force in pulling the barge along the entire length of the canal?
228 kJ228\text{ kJ}228 kJ
489 kJ489\text{ kJ}489 kJ
540 kJ540\text{ kJ}540 kJ
0.489 kJ0.489\text{ kJ}0.489 kJ