Mathematics for IGCSE & O level - Graphs In Practical Situations (Section 6 - No. 20)
What does the slope of the tangent line represent in a speed-time graph that is a curve?
The speed at that instant
The gradient of the tangent at that instant
The instantaneous rate of change of speed
The total distance travelled
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The tangent line gives the instantaneous rate of change (acceleration) and the speed at that specific point in time.