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ease into it more gently: we're not here to scold the reader for not having mastered high school physics
The '''velocity''' of an object is the rate of change of its [[displacement]] and direction of the change. In other words, it is a combination of both speed and direction. If the position of an object is some [[function]] of [[time]], then the velocity is the [[derivative]] of that function:
The '''velocity''' of an object is a combination of both speed and direction: in formal terms, it is the rate of change of its [[displacement]] and direction of that change. If the position of an object is some [[function]] of [[time]], then the velocity is the [[derivative]] of that function:
:<math>v(t)={\mathrm{d}x \over \mathrm{d}t}</math>
:<math>v(t)={\mathrm{d}x \over \mathrm{d}t}</math>