A small block slides down on a smooth inclined plane, starting from rest at time \( t=0 \). Let ...

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A small block slides down on a smooth inclined plane, starting from rest at time \( t=0 \). Let \( S_{n} \) be the distance travelled by the block in the interval \( t=n-1 \) to \( t=n \). Then, the ratio \( \frac{S_{n}}{S_{n+1}} \) is
(a) \( \frac{2 n}{2 n-1} \)
(b) \( \frac{2 n-1}{2 n} \)
(c) \( \frac{2 n-1}{2 n+1} \)
(d) \( \frac{2 n+1}{2 n-1} \)
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