# physics

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i have a question in my book

centripetal acceleration = r^-1 v^2

ok I agree

but in my book acceelration is labeled as a vector but yet the velocity is not...

Why?

• physics -

By v it means the component of the V vector that is tangent to the circle of radius r.

• physics -

It identifies the centripetal acceleration as an inward pointing vector because the author wants to make sure you know that centripetal acceleration has a direction, namely toward the center.

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