Instantaneous acceleration is the rate of change of velocity at a specific moment in time. It is a vector quantity and can be found as the derivative of velocity with respect to time.
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Instantaneous acceleration is given by $a(t) = \frac{dv}{dt}$, where $v$ is velocity and $t$ is time.
It has both magnitude and direction, making it a vector quantity.
Instantaneous acceleration can be positive (speeding up) or negative (slowing down).
It can be determined graphically by finding the slope of the tangent to the velocity-time graph at a given point.
In uniform motion, instantaneous acceleration is zero; in uniformly accelerated motion, it remains constant.