Robert has just bought a new model rocket, and is trying to measure its flight characteristics. The rocket engine package claims that it will maintain a constant thrust of 12. 3 N until the engine is used up. Robert launches the rocket on a windless day, so that it travels straight up, and uses his laser range-finder to meaure that the height of the rocket when the engine cuts off is 16. 8 m. He also measures the rocket's peak height, which is 21. 3 m. If the rocket has a mass of 0. 763 kg, how much work is done by the drag force on the rocket during its ascent?