When you jump on a trampoline, you have energy while you are moving up or down in your jumps. You have energy each time you pause for an instant before changing direction at the top or bottom of a jump. At the top a jump because of gravity, and at the bottom of a jump because of the stretchinness of the trampoline.

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

What is the measurement of how fast an object moves relative to a reference point?

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.