A ball of mass m makes a head-on elastic collision with a second ball at rest and rebounds with a speed equal to one-third its original speed. What is the mass of the second ball?
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Two balls with equal masses, m, and equal speed, v, engage in a head on elastic collision. ... Since the balls of equal mass are moving at equal and opposite speeds, the total linear momentum of the system is zero. For linear momentum to be conserved after the collision, both balls must rebound with the same velocity.
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