5144：NPY and shot

题目描述

NPY is going to have a PE test.One of the test subjects is throwing the shot.The height of NPY is H meters.He can throw the shot at the speed of v0 m/s and at the height of exactly H meters.He wonders if he throws the shot at the best angle,how far can he throw ?(The acceleration of gravity, g, is $9.8m/s^2$)

输入解释

The first line contains a integer $T(T \leq 10000)$,which indicates the number of test cases.
The next T lines,each contains 2 integers $H(0 \leq h \leq 10000m)$,which means the height of NPY,and $v_0(0 \leq v_0 \leq 10000m/s)$, which means the initial velocity.

输出解释

For each query,print a real number X that was rounded to 2 digits after decimal point in a separate line.X indicates the farthest distance he can throw.

输入样例

2
0 1
1 2

输出样例

0.10
0.99

提示

If the height of NPY is 0,and he throws the shot at the 45° angle, he can throw farthest.

来自杭电HDUOJ的附加信息

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heyang

该题目是Virtual Judge题目，来自杭电HDUOJ

题目来源 BestCoder Round #22

源链接： HDU-5144

最后修改于 2020-10-25T23:20:10+00:00 由爬虫自动更新

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通过率 --%

时间上限	内存上限
2000/1000MS(Java/Others)	32768/32768K(Java/Others)