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I'm currently developing an application. I'm practically done, but I have one big issue (for me). So I have 3-axis acceleration from my android device. Now I want to have the general acceleration at time t, because after that i want to calculate velocity.

So, what I know:

to get velocity there is this formula : v=u+at

to get the general acceleration: √x^2+y^2+z^2

The problem: With this two formulas my acceleration is always positive so my velocity is always speeding up.

Is this normal ? How to I get negatives accelerations ?

Thanks for your answer