When an object is dropped, the number of feet N that it falls is given by the formula N=1/2gt2, where t is the time in seconds since it was dropped and g is 32.2, if it takes 5 seconds for the object to reach the ground, how many feet does it fall during the last 2 seconds?
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A64.4
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B96.6
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C161.0
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D257.6
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E402.5
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正确答案: D