In 0.72s a student exerts 500 N of force lifting a backpack straight up 1.5 m. How much did the backpack's potential change?
increased by 750 J
decreased by 333 J
increased by 333 J
decreased by 750 J

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?

If you wanted to move an electron from the positive to the negative terminal of the battery, how much work w would you need to do on the electron? enter your answer numerically in joules.

Which of the following list the divisions of the geologic time scale in order from longest to shortest