Another question is: at what angle should you fire your projectile

另一个问题是以多大角度抛出
so it will go the furthest?

物体能飞得最远
You can find the equation,

你能写出方程式
but you've got to think a little bit before you solve everything.

不过在解题之前你最好能稍作思考
It's good to have an idea of what's coming.

这样能对接下来会发生什么有个初步概念
Imagine you got this monster cannon to fire things.

设想你有一门火力强劲的大炮发射炮弹
It's got a fixed speed v0.

炮弹有个恒定的速度 v0
How do you want to aim it so you can be most effective?

你怎样瞄准才能使攻击最有效
Go as far as you can?

是让它打得尽量远吗
There are two schools of thought.

大致有两种思路
One says, aim at your enemy and fire like this.

一种是直接瞄准敌人像这样射击
Then it lands on your foot,

然后它就会落在你的脚边