Originally Posted By: Paul
the two bullets are now stuck together but are motionless.

they now have a combined mass of 2 kg.

2 kg mass was lost because the kinetic energy was lost.

thats pretty easy to see.


Yes Paul, the 2 bullets lost their kinetic energy. However, the energy of the universe didn't change, because the kinetic energy was converted to heat, which was then radiated away. The total energy is the same.

An example. Did you ever hit something hard and solid, say a nail, with a hammer? Try it and then feel the spot that you hit. The spot will be warmer, and the place on the hammer head will be warmer. That is the energy that was the kinetic energy of the hammer.

Bill Gill

C is not the speed of light in a vacuum.
C is the universal speed limit.