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• In 1908, an object from outer space devastated2,000km2of forest in Siberia. The object was between10m and 100m in diameter and traveled at a maximumspeed of 15km/sec. It exploded at an altitude of 8km andreleased energy equivalent to 20million tons of TNT. Twoscientists discuss whether this object was a comet or anasteroid.

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• 15、在这种情况下，物体的速度随时间呈线性变化。 In this case, the velocity of an object ____________ the time.

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