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.​

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?