Acommuting student leaves home and drives to school at an average speed of 39.0 km/h. after 23.0 min he realizes that he has forgotten his homework and returns home to get it at the same average speed. it takes 10.0 min to find the report, after which the trip to school 39.0 km away to the east is resumed at the same speed as before. what is the average speed for the entire trip ? what is the average velocity for the entire trip?

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.