How do I find out what the average accelleration is of an object. "not constant"

Hello, I've been studying physics by myself some days. And I learned the basics of, scalar. Vector.. distance - displacement - speed - velocity and brief accelleration. Its easy to measure the constant accelleration. but what if its not constant ?..

I found the formula for measureing velocity and speed. That was easy. V divided by T equals the average V or speed

also last up, what does the V.f or V.i mean ? aswell as m /s ^ 2 ? thank you all.. also if you wouldn't mind.. explaining to that i can understand :) just started

Typically people deal with constant acceleration most of the time in foundation physics, partly I expect because acceleration due to gravity is constant. When it isn't, you have to go back to the definition of acceleration, which is rate of change of velocity ie dv/dt.

No idea about V.f or Vi

m/s^2 is just a convention to write the units of acceleration which is (meters per second) per second. If you treat (m/s)/s as mathematical variables you can turn that into m/s^2 or indeed ms^-2.

Average acceleration is different. For average acceleration the only valid calculation is

(initial velocity) - (final velocity) all divided by total time.

Never be temped to average the value of the acceleration itself as it tends to lead to gross errors.

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