The distance between the earth and the sun is about 1.5 × 10 ^ 8 km. Find the average speed of the earth around the sun (expressed by the scientific counting method in kilometer seconds, 1 365 days

The velocity of the earth v = L / T
=2πR÷（365×24×60×60）
=2×3.14×1.5×10^8÷（365×24×60×60）
≈29.87km/s

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