An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. But she does have devices to measure distance and time accurately. She knows her own mass is 79.8 , but she is unsure of the mass of a large gas canister in the airless rocket. When this canister is approaching her at 3.70 , she pushes against it, which slows it down to 1.00 (but does not reverse it) and gives her a speed of 2.50. what is the mass of this canister? How much kinetic energy is lost?