Answers: 3
![f_0=f_s\left [ \frac{v}{v-(-v_s)} \right ]](/tpl/images/0212/7261/5510c.png)
![f_0=f_s\left [ \frac{v}{v+v_s} \right ]](/tpl/images/0212/7261/49763.png)
![v_s=v\left [ \frac{f_s}{f_0}-1\right ]](/tpl/images/0212/7261/1073c.png)
![v_s=340\left [\frac{514}{483}-1 \right ]](/tpl/images/0212/7261/631e9.png)
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