Figure 2 shows a marble which is on a curved rail. Then, it is pushed down the rail.
(a) What energy does the marble have when it is at position P? Why?
(b) What is the conversion of energy experienced by the marble at position Q?
(c) What energy does the marble have when it is at position R? Why?
5. Figure 3 shows a pendulum bob at position X. It is then released and it swings to position Y and Z.