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What is the derivation for your y_max equation?

I'm just curious as to where it comes from.

Oh, well I'm missing a 2 in there, for one.

Oh.
\[\tan \Theta = 1\]

For that, though, I just get 45 degrees, and that's not correct, is it?

That doesn't seem right. Let me solve it by hand.

Somewhere around 75 degrees.

*Wrong.

How did you get
\[t _{flight}=\left(\begin{matrix}2vsin(\theta) \\ g\end{matrix}\right)\]?

\[t _{flight}\] is twice the time of \[y _{\max}\]