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That simply means that the direction of the acceleration is relevant. For example, if something is moving in the "forward" direction, it isn't the same if we accelerate it forward, backward, or sideways. The results are different.Also, acceleration is calculated as dv/dt, meaning you divide a velocity difference by a time. Since velocity is itself a vector, acceleration is also a vector.

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∙ 9y ago
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Haris Yousafzai

Lvl 1
∙ 2y ago
because it have both magnitude and direction

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