The velocity of a proton emerging from a Van de Graaff accelerator is 25.0% of the speed of light. What was the equivalent voltage through which it was accelerated? The mass of a proton is

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.