What is the answer? Please help this is science

Why are pipes bursting in the in extremely cold weather?

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

Which scenario is most similar to the type of collision that gas particles have according to kinetic molecular theory