The barringer meteor crater in northern arizona is 180m, Ask an Expert

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The Barringer meteor crater in northern Arizona is 180m deep and 1.2 km in diameter. The fragments of the meteor lie just below the bottom of the crater. If these fragments accelerated at a constant rate of 4×10^(5) m/s^2 as they plowed through the Earth, what was the meteor's speed at impact?

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