Momentum and kinetic energy are involved in all collisions.
All collisions have one common characteristic when no external forces act on the system.
In a system with two moving objects, when a collision occurs between the objects:
A) the total kinetic energy is always conserved.
B) the total momentum is always conserved.
C) the total kinetic energy and total momentum are always conserved.
D) neither the kinetic energy nor the momentum is conserved.
E) none of the above choices are valid.
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