A 20 g bullet moving a horizontal velocity of 360 m/s comes to a stop 11 cm within a solid wall. (a) What is the change in the bullet's mechanical energy

Consider the phase change taking place in the picture. you could use all but one statement to describe what is happening here. that is: a) temperature is increasing. b) kinetic energy is increasing. c) the space between the particles remains the same. d) the attractive force between the particles is decreasing.