The velocity of an object is its speed in a particular direction. .
Features of the graphs
The vertical axis of a velocity-time graph is the velocity of the object. The horizontal axis is the time from the start.
When an object is moving with a constant velocity, the line on the graph is horizontal. When an object is moving with a constant acceleration, the line on the graph is straight, but sloped.
The diagram on the next page shows some typical lines on a velocity-time graph.
The steeper the line, the greater the acceleration of the object. The blue line is steeper than the red line because it represents an object with a greater acceleration.
A line sloping downwards represents an object with a constant deceleration - slowing down.
The gradient of a velocity-time graph represents the acceleration
The area under a velocity-time graph represents the distance covered
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