How can the momentum of an object be changed?
A. by speeding it up only
B. by slowing it down only
C. by speeding it up or slowing it down

During cooling, the kinetic energy of the molecules falls. why does this happen? a.the motion of the molecules increases. b. the motion of the molecules slows down. c.the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.