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Source: http://cnx.org/contents/031da8d3-b525-429c-80cf-6c8ed997733a@8.32:68/College_Physics

When I was introduced acceleration at the beginning, it was stated that an acceleration ##a = \frac{\Delta v}{\Delta t}## can be a change either in speed's magnitude or direction; or both. In other words, in any case I would be dealing with an acceleration ##a##.

Does it mean that this is not true?

Do I need to be more specific?

If linear acceleration ##a_t## is a change in the speed's magnitude and ##a_c## a change in its direction, how is the change in speed's magnitude and direction at the same time called? Just acceleration?

Thanks!