Question: Two balls undergo a perfectly elastic head-on collision, with one ball initially at rest. If the incoming ball has a speed of (200 mathrm{~m} /

Two balls undergo a perfectly elastic head-on collision, with one ball initially at rest. If the incoming ball has a speed of $200 \mathrm{~m} / \mathrm{s}$, what are the final speed and direction of each ball if

a. The incoming ball is much more massive than the stationary ball?

b. The stationary ball is much more massive than the incoming ball?

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