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A ball of mass 0.205 kg has a velocity of 1.47 m/s; a ball of mass...

A ball of mass 0.205 kg has a velocity of 1.47 m/s; a ball of mass 0.309 kg has a velocity of -0.396 m/s.They meet in a head-on elastic collision.

(a) Find their velocities after the collision.
(first ball)
(second ball)

(b) Find the velocity of their center of mass before and after the collision.
(before)
(after)

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