How do i calculate the volume of water, in milliliters, displaced by a piece of gold weighing 18.2g. can someone show me the steps to working this problem?

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