1. A giant pinball machine is started by pulling the ball back against a spring. A 5 kilogram ball is pulled back a distance of 3m with a spring with a spring constant of 120N/m. What is the
velocity of the ball as it leaves the spring?

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.