看看球移动时速率和加速度向量的变化。

See the velocity and acceleration vectors change as the ball moves.

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了解速率和加速度向量。

Learn about velocity and acceleration vectors.

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我们还学过加速度，也就是速度向量的导数。

And, we've also learned about acceleration, which is the derivative of velocity.

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我们还学过加速度，也就是速度向量的导数。

And, we've also learned about acceleration, which is the derivative of velocity.

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