A projectile in flight explodes into several fragments. The total momentum of the fragments immediately after?
this explosion:
A. is the same as the momentum of the projectile immediately before the explosion
B. has been changed into kinetic energy of the fragments
C. is less than the momentum of the projectile immediately before the explosion
D. is more than the momentum of the projectile immediately before the explosion
E. has been changed into radiant energy
Pls. Explain
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Verified answer
A The explosive force acts on the fragments to accelerate them, Assume the explosion creates two fragments of equal mass, one travelling forwards and one travelling backwards. Kinetic energy is increased in both fragments, but total momentum is 0. Now add initial momentum of the projectile. Obviously answer A is correct