instantaneous speed?

Question

what is instantaneous speed?
How is is determined or caluculated on a graph?
On a graph is it something about drawing a triangle and its diagnals or tangent or what exactly ? could someone plz clarify this for me?

Answer 1

Instantaneous speed is the speed at a particular point in time, so it is the tangent ( or dx/dt) for a point on a curve (drawn on the graph), if the curve represent a function of distance to time.