Sliding down a rough 45 degree incline takes n times as long as a smooth one: coefficient of friction

1. A.
   $\sqrt{1 - \frac{1}{n^{2}}}$
2. B.
   $1 + \frac{1}{n^{2}}$
3. C.
   $1 - \frac{1}{n^{2}}$
4. D.
   $\sqrt{\frac{1}{1 - n^{2}}}$

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1. A.
   $1 - \frac{1}{n^{2}}$
2. B.
   $1 - n^{2}$
3. C.
   $\sqrt{1 - \frac{1}{n^{2}}}$
4. D.
   $\sqrt{1 - n^{2}}$

Tap an option to check your answer.