最新提问
我的动态
登录后查看动态
题目内容双击单词支持查询和收藏哦～
An apple falls straight to the ground from a tree branch 8 meters above the ground. The apple`s height above the ground, $$t$$ seconds after it starts falling, is $$H$$ meters, where $$H=8-4.9t^{2}$$ and $$t$$ ≥ 0. How many seconds after the apple starts falling does it hit the ground?
Give your answer to the nearest 0.1 second.
_____seconds
Give your answer to the nearest 0.1 second.
_____seconds
1.3 显示答案
· 相关考点
3.6.1 函数的定义
3.6.1 函数的定义
以上解析由 考满分老师提供。
