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delta
change in a variable between two times is its value at the final time minus at the initial time.

position is a vector object is a vector that point from the origin of the coordinate system to the objects location in space. SI unit of position (m)

Velocity
Velocity is rate of change of the position vector.
Δ T equation
Δ x = xf - xi
Velocity
a vector that points in the direction the object is moving