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
答案是B怎么得呢???求教
一个向下的抛物线,t=3时,it reaches its maximum height。
所以题目所求为t=5,代入即得
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