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标题: 蓝皮书60题 [打印本页]

作者: grassgreen 时间: 2009-5-9 09:12 标题: 蓝皮书60题

60. An object thrown directly upward is at a height of h feet after t seconds, where h= -16(t-3)＾2+150. At what height, in feet, is the object 2 seconds after it reaches its maximum height?

A. 6

B. 86

C.134

D.150

E. 214

哪位好心人帮我讲讲这道题，正确答案为什么是B

作者: davidsfo 时间: 2009-5-9 19:58

由条件知道t=3时h有最大值，所以2秒后，就是t=5，代入式子，得h=86

作者: grassgreen 时间: 2009-5-11 06:50

非常感谢！

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