When a roller coaster gets to the bottom of a descent, describe the energy transfers and changes to energy stores that happen if: a) the brakes are applied to stop it
b) it goes up and over a second hill.

its B

Explanation:

It's B & A at the same time because A. a roller coaster uses brakes to slow down and stop. B is the most reasonable answer. Because all roller coasters go up and over a second time over the hill, but they also slow down. But go with B.

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heat the gas and measure the pressure

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.