Which statement about energy transfer in a wave is true?

If a balloon is taken outside on a very cold day, what will occur?

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?