Substitute in the given equation and 1. Given: \[ \begin{aligned} v_{\mathrm{avg}} & =\frac{v_{f}+v_{i}}{2} \\ v_{f} & =6.20 \mathrm{~m} / \mathrm{s} \\ v_{i} & =3.90 \mathrm{~m} / \mathrm{s} \\ v_{\mathrm{avg}} & =? \end{aligned} \]
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Substitute in the given equation and find the unknown quantity. $$ \begin{aligned} \text { Given: } \quad v_{\mathrm{avg}} &=\frac{v_{f}+v_{i}}{2} \\ v_{f} &=6.20 \mathrm{~m} / \mathrm{s} \\ v_{i} &=3.90 \mathrm{~m} / \mathrm{s} \\ v_{\mathrm{avg}} &=? \end{aligned} $$
Motion
Uniformly Accelerated Motion and Free Fall
Solve each formula for the quantity given. $$v_{\mathrm{avg}}=\frac{1}{2}\left(v_{f}+v_{i}\right) \text { for } v_{i}$$
Problem Solving
Formulas
Substitute in the given equation and find the unknown quantity. $$ \begin{aligned} \text { Given: } & a=\frac{v_{f}-v_{i}}{t} \\ & a=3.07 \mathrm{~m} / \mathrm{s}^{2} \\ & v_{f}=16.8 \mathrm{~m} / \mathrm{s} \\ & t=4.10 \mathrm{~s} \\ & v_{i}=? \end{aligned} $$
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