friction
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No.
Some of the energy is converted from the motion of the bodies to sound and heat when it is used to overcome friction between the two bodies.
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Particles in gases are very far apart and there is a negligible amount of attraction force between these particles. Gas molecules have to move a long way before they interact and collide with other molecules. Sound energy slows down and does not move face when the molecules are not in contact with each other.
No. It cools at a rate proportional to the difference between its temperature and that of it's surrounding. The cooler it gets, the closer it will get to room temperature, and the cooling slows down.