If we take a tennis ball and drop it from a certain height above the ground on earth, it collides inelastically, with the maximum height it can reach reducing after each collision due to loss of energy to the atmosphere, sound energy and to change the vibrational energy of both the ball and the floor.
Now consider the same experiment in vacuum. The lost energy shouldn't escape to the atmosphere to heat it up, or to contribute to producing sound; it can only change the internal energies of the floor and the ball itself. Is the amount of energy loss the same? If yes, then can we say that dropping a ball in vacuum heats it up more than it could've heated up in an atmosphere full of air? This would be the case if the maximum possible height reached by the ball after each collision would remain the same.