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Two billiard balls of the same size and mass are in contact on a billiard table. A third ball of the same
\( \mathrm{P} \) size and the mass strikes, them symmetrically and remains at rest after the impact. The coefficient of
W restitution between the balls is
(1) \( \frac{1}{2} \)
(2) \( \frac{3}{2} \)
(3) \( \frac{2}{3} \)
(4) \( \frac{3}{4} \)
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