Question: A neon atom (m = 20.0u) makes a perfectly elastic collision with another atom at rest. After the impact, the neon atom travels away at

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

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