Question

This graph shows a ball rolling from A to G.
rollercoaster.gif

Which letter shows the ball when it has the maximum kinetic energy?

Answer 1

Maximum kinetic energy occurs where the gravitational potential energy is smallest — i.e. at the lowest point of the track (where the ball has its greatest speed). So the correct letter is whichever point on the picture is at the lowest height (the lowest valley).

If you want me to name the exact letter, please upload the image again or tell me which letter is at the lowest point.