Displacement -Time and Distance-Time Graphs

Displacement-time graphDisplacement is a vector quantity so can be negative or positive in one dimension.Time is a scalar quantity and can only be positive. The axes of the graph reflect this. The gradient of a displacement-time graph is the velocity.In the graph below the direction does not change.A = constant velocityB= at restC= constant velocity but slowerDistance-time graphDistance is a scalar quantity, so a distance-time graph can never slope downwards. The gradient of a distance-time graph is the speed.