\left\{ \begin{array} { l } { \frac { 1 } { 2 } m v _ { c } ^ { 2 } = k x } \\ { k = 3 } \\ { m = 7 } \\ { x = 2 } \end{array} \right.
Solve for m, v_c, k, x
x=2\text{, }m=7\text{, }v_{c}=-\frac{2\sqrt{21}}{7}\approx -1.309307341\text{, }k=3
x=2\text{, }m=7\text{, }v_{c}=\frac{2\sqrt{21}}{7}\approx 1.309307341\text{, }k=3
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