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The book bullet tells how and why the bullet or missiles fly. It shoots out because of recoil in the gases from expansion because of centrifugal forces generated in the atoms of gas from elastic recoil of the atoms on unwinding. Energy is stored in matter as elastic convolutions as proven in the book. Proof for this is physical force releases energy in atoms as in fire cracker which explodes on hammering. Thus energy storage has to be a physical phenomenon.