Part A

A neon atom $\backslash (\backslash$mathrm$\{$m$\}=20\mathrm{.}0\backslash$mathrm$\{$u$\}\backslash )$ makes a perfectly elastic collision with another atom at rest. After the impact, the neon atom travels away at a $\backslash (55\mathrm{.}6^\{\backslash$circ$\}\backslash )$ angle from its original direction and the unknown atom travels away at a $\backslash (-50\mathrm{.}0^\{\backslash$circ$\}\backslash )$ angle.

What is the mass $($in $\backslash (\backslash$mathbf$\{$u$\}\backslash ))$ of the unknown atom? $[$Hint$.$ You could use the law of sines.$]$

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