A 0.0380kg model rocket is mounted on a nearly frictionless horizontal rail for testing purposes and a 0.0964kg rocket engine is placed in the model. The rocket engine is designed to give a constant thrust of 13.8N for the 0.856s burn, until the mass of the engine is reduced to 0.0080kg and it flames out. What is the impulse imparted to the rocket? Answer: 1.18x10^1 N*s. I cannot get this answer. Please help. Thank you.