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Can anyone help me with this simple grade 12 math question on joint variation? I'm stuck, I'm the WORST at word problems.

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Thanks!

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Remember that in general "$F$ varies jointly as $x$ and $y$" means $F=kxy$ for some constant $k$. Here you have $q$ in place of $F$, $t$ in place of $x$, and $v^2$ in place of $y$. Can you figure it out from there?