4.
a baseball player throws a baseball straight up into the air with an initial speed of 25 m/s.
a. what is the maximum height to which the ball rises?
b. what is the speed of the ball when it is halfway up to its maximum height?

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.