How would the system change if the container were placed on a hot plate?

A. Some kinetic energy would be produced.
B. Some kinetic energy would be destroyed.
C. The kinetic energy of the molecules would increase.
D. The kinetic energy of the molecules would decrease.

Two carts, one of mass 2m and one of mass m, approach each other with the same speed, v. when the carts collide, they hook together. assume that positive momentum is to the right. which graph best represents the momentum of both carts over time, before and after the collision?