A ball is moving at 5.0 m/s with a mass of 3.0 kg strikes a second ball with a mass of 4.0 kg that is sitting motionless. What is the velocity of the second ball if the first ball stops immediately after the collision?

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.