planet neptune travels in a nearly circular orbit of radius 4.5x10⁹ km about the sun.it takes 165 years complete one trip around the sun.how fast th eneptune traveln in its orbit?

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$$\begin{gathered} dis\tan ce travlled in one complete rotation is 2\pi r \\ speed of the neptune in its orbit = \frac{dis\tan ce}{time} \\ speed=\frac{2\pi r}{t}=\frac{4.5\times {10}^9 km}{165 year}=\frac{4.5\times {10}^9\times {10}^{3 }m}{165\times 365\times 24\times 60\times 60 s}=\frac{4.5\times {10}^{12} m}{5.2\times {10}^9}=0.86\times {10}^3 m/s \end{gathered}$$

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