速率保持不变,但速度矢量会发生变化。
The speed is not changing, but the velocity vector is changing.
速度的平方为速率。
物理中速率和速度的概念,是泾渭分明的。
There is a very big difference in physics between speed and velocity.
This is the starting speed, that's the rate at which it is gaining velocity, and that's how long it's been gaining it.
这是起始时的速度,这是速度的增长速率,这是加速的时间
The angle is increasing at a steady rate, so we know it's going at a steady speed.
转过的角度以恒定速率增加,所以我们知道它以一个恒定的速度运动
It's gaining speed at some rate a.
速度的增长速率为a
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