Period, frequency or amplitude from the velocities at two displacements

1. A.
   $2\pi\sqrt{\frac{x_2^2 - x_1^2}{v_2^2 - v_1^2}}$
2. B.
   $2\pi\sqrt{\frac{x_1^2 - x_2^2}{v_2^2 - v_1^2}}$
3. C.
   $2\pi\sqrt{\frac{x_1 x_2}{v_2^2 - v_1^2}}$
4. D.
   $2\pi\sqrt{\frac{x_1 + x_2}{v_1 v_2}}$

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1. A.
   $\sqrt{\frac{V_1^2 x_2^2 - V_2^2 x_2^2}{V_1^2 - V_2^2}}$
2. B.
   $\sqrt{\frac{V_1^2 - V_2^2}{V_1^2 x_2^2 - V_2^2 x_1^2}}$
3. C.
   $\sqrt{\frac{V_1^2 x_2^2 - V_2^2 x_1^2}{V_1^2 - V_2^2}}$
4. D.
   $\sqrt{\frac{V_1^2 x_1^2 - V_2^2 x_2^2}{V_1^2 - V_2^2}}$

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1. A.
   $2\pi$ s
2. B.
   $\pi$ s
3. C.
   $3\pi$ s
4. D.
   $4\pi$ s

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1. A.
   $\frac{1}{2\pi}\sqrt{\frac{V_1^2 - V_2^2}{x_1^2 - x_2^2}}$
2. B.
   $2\pi\sqrt{\frac{x_1^2 - x_2^2}{V_1^2 - V_2^2}}$
3. C.
   $\frac{1}{2\pi}\sqrt{\frac{V_2^2 - V_1^2}{x_1^2 - x_2^2}}$
4. D.
   $2\pi\sqrt{\frac{x_1^2 - x_2^2}{V_2^2 - V_1^2}}$

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1. A.
   $\sqrt{\dfrac{V_2^2 - V_1^2}{x_1^2 - x_2^2}}$
2. B.
   $\sqrt{\dfrac{V_2^2 - V_1^2}{x_2^2 - x_1^2}}$
3. C.
   $\sqrt{\dfrac{V_2^2 - V_1^2}{x_1x_2}}$
4. D.
   $\sqrt{\dfrac{V_1V_2}{x_1 + x_2}}$

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