Speed of a particle whose x and y coordinates are constants times a power of t

1. A.
   $t\sqrt{\alpha^2 + \beta^2}$
2. B.
   $3t\sqrt{\alpha^2 + \beta^2}$
3. C.
   $t^2\sqrt{\alpha^2 + \beta^2}$
4. D.
   $3t^2\sqrt{\alpha^2 + \beta^2}$

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1. A.
   $\ 2t\sqrt{a^{2} + b^{2}}$
2. B.
   $\ 2t\sqrt{a^{2} - b^{2}}$
3. C.
   $2t(a + b)$
4. D.
   $\frac{2t}{\sqrt{a^{2} + b^{2}}}$

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