求解英文物理题（关于运动学）

题目

求解英文物理题（关于运动学）
A model rocket is launched straight upward
with an initial speed of 51.9 m/s.It acceler-
ates with a constant upward acceleration of
1.58 m/s2
until its engines stop at an altitude
of 150 m.
1.What is the maximum height reached by
the rocket?The acceleration of gravity is
9.81 m/s2.
Answer in units of m.
2.When does the rocket reach maximumheight?
Answer in units of s.
3.How long is the rocket in the air?
Answer in units of s.

答案

我用中文答,可以吧!
v2-v'2=2as
v'2=3167.61
0.5mv'2=mgh
h=161.5
161.5+150=311.5
最大高度为311.5 m
这是第一问的答案
后面两位会做但数太麻烦了,sorry 啊
不明白老外为啥那么爱算数啊