Please help! Somple Work-energy problem!! Sam works at an amusement park. A boat of children on a water ride comes the the pier at the end of the ride. They are moving at a constant speed of 1.2 m/s, and the loaded boat has a mass of 1200kg. Sam slows the boat down by pushing on it until it comes to rest at the pier. If he stops it in a distance of 1.75m, and his arms make a 30o angle above the horizontal, * a) how much work did Sam do on the boat? * b) how large a force did he apply to the boat? I thought if I added the mass X gravity that would five me force. Then I took F cos theta X s to get 1.51 J and the foce would be 11760. I am not sure if that is right.