When 1kg of a substance changes from solid to liquid at its melting point, it must absorbed an amount of heat equal to which of the following? A. specific heat of phase changes
B. specific heat capacity
C. latent heat of fusion
D. latent heat of vaporization

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.