At the end of the Galactic Green Lion roller coaster, a 400 kg car has a speed of 22 m/s (point A). For safety, the coaster has to be going only 3 m/s when it enters the platform (point B) for the brakes to be able to stop in time. How high does the final hill need to be to slow down the coaster enough?

Aboy with a mass 25 kg climbs into a small tree. he sits on a branch that is 2.o m above to the ground.what is his gravitational potential energy above the ground?

What is a subatomic particle with a negative charge and very little mass?

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.