AP physics B

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A billiards cue ball of mass 0.380 kg has a perfectly elastic head-on collision with a standard pool ball. The second pool ball which started at rest travels with a speed which is half the original speed of the cue ball.
(a) Calculate the mass of the pool ball.
kg
(b) Calculate the fraction of the original kinetic energy (ÄKE/KE) that gets transferred to the pool ball.

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