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How to find Acceleration from a Velocity-Time Graph:
The acceleration of a velocity-time graph is equal to the slope of the line. More specifically, the instantaneous acceleration is equal to the slope of the tangent line which touches the graph on 1 point. The average acceleration is equal to the slope of the secant line which touches the graph at least on 2 points. The average acceleration can be calculated using the slope formula m = (y2 - y1) / (x2 - x1). 
To find the instantaneous acceleration, you can use a limit process, or you can find the derivative of the velocity function. 
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