Velocity: Velocity is a vector quantity that describes an object's speed and direction of motion. It is calculated by dividing displacement by time taken.
Tangent Line: In calculus, the tangent line represents the instantaneous rate of change of a function at a specific point. For an acceleration vector-valued function, it represents the direction of motion at that point.
Second Derivative: The second derivative measures how the rate of change (derivative) itself changes with respect to another quantity. In the context of acceleration, it gives us information about jerk or changes in acceleration.