Answer
$t=\dfrac{v-v_0}{-g}$
Work Step by Step
Subtract $v_0$ from both sides.
$v-v_0=-gt+v_0-v_0$
Simplify.
$v-v_0=-gt$
Divide both sides by $-g$.
$\dfrac{v-v_0}{-g}=\dfrac{-gt}{-g}$
Simplify.
$\dfrac{v-v_0}{-g}=t$
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