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数学

速度距离时间

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For unit conversion: 1 m/s = 3.6 km/h. Multiply m/s by 3.6 to get km/h. Conversely: km/h ÷ 3.6 = m/s. A 100m sprinter running 9.58 seconds averages 10.44 m/s = 37.6 km/h.

难度:中级

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Light takes about 8.3 minutes to travel from the Sun to Earth (149.6 million km at 299,792 km/s). When you look at the Sun, you're seeing it as it was 8 minutes ago.

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