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I am looking at centripetal acceleration, and I know that even at a constant speed the object is acceleration because its velocity is changing. But I don't understand how it is changing, like when is it negative and when is it positive ? Like if you were to make a simulation of the object going round in circles what would the velocity look like as it goes around, negative when down and positive when up? What about horizontal?

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# B Help on Circular motion

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