A barge of mass 5.0 Ã 104 kg is pulled along the Erie Canal by two mules,

Question:

A barge of mass 5.0 Ã— 104 kg is pulled along the Erie Canal by two mules, walking along towpaths parallel to the canal on either side of it. The ropes harnessed to the mules make angles of 45° to the canal. Each mule is pulling on its rope with a force of 1.0 kN. How much work is done on the barge by both of these mules together as they pull the barge 150 m along the canal?