Can you solve these?

How does a hydroelectric power plant converts energy into energy.

Which of these statements explains the difference between nuclear binding energy and the strong nuclear force ?

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d