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A small block slides down on a smooth inclined plane, starting
\( \mathrm{P} \) from rest at time \( t=0 \). Let Sn be the distance travelled by the

W block in the interval \( t=n-1 \) to \( t=n \). The, the ratio \( \frac{S_{n}}{S_{n+1}} \) is:
(a) \( \frac{2 n-1}{2 \mathrm{n}+1} \)
(b) \( \frac{2 \mathrm{n}+1}{2 \mathrm{n}-1} \)
(c) \( \frac{2 n}{2 n-1} \)
(d) \( \frac{2 \mathrm{n}+1}{2 \mathrm{n}} \)
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