A neon atom (m=20.0 u) makes a perfectly elastic collision with another atom at rest. After the impact, the neon atom travels away at a
A neon atom (m=20.0 u) makes a perfectly elastic collision with another atom at rest. After the impact, the neon atom travels away at a 55.6 angle from its original direction and the unknown atoms travels away at -50.0 angle. What is the mass (in u) of the unknown atom
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