A heavy ball moving with speed \( v \) collides with a tiny ball. The collision is elastic, then....

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A heavy ball moving with speed \( v \) collides with a tiny
\( \mathrm{P} \)
ball. The collision is elastic, then immediately after the impact, the second ball will move with a speed approximately equal to
(1) \( v \)
(2) \( 2 v \)
(3) \( \frac{v}{2} \)
(4) \( \frac{v}{3} \)


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