TRUE AND FALSE QUESTIONS IN PHYSICS 6. Change in mass affects KE more than a change in velocity
7. For acceleration due to gravity on Earth (g), we use 9.8 m/s^2
8. In a closed system, we can say that the maximum amount of Kinetic Energy must equal the maximum amount of Potential Energy in a different part of the closed system
9. The P in GEWAUP stands for Practice. 10. 1st Law of Thermodynamics states that energy cannot be created or destroyed.​

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 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?