change in velocity
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The area under an acceleration-time graph is equal to the object's velocity (not change in velocity).
Magnitude of acceleration (but conveys no informationregarding acceleration's direction).
The slope of the speed/time graph is the magnitude of acceleration. (It's very difficult to draw a graph of velocity, unless the direction is constant.)
Motion at a constant speed - no acceleration or deceleration.
instantaneous acceleration* * * * *No it does not.The graph is a distance-time graph so the coordinates of a point on the graph represent the position (distance) at the specified time. The gradient of the tangent to the curve at that point represents the instantaneous radial velocity. The second derivative at that point, if it exists, would represent the acceleration.