How many kilograms of ice at a temperature of -21.8 ∘C∘C must be dropped in the water to make the final temperature of the system 37.6 ∘C∘C?

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