Velocity time-graphs
You should be able to explain velocity-time graphs for objects moving with a constant velocity or constant acceleration.
The velocity of an object is its speed in a particular direction. This means that two cars travelling at the same speed, but in opposite directions, have different velocities.
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 steeper the line, the greater the acceleration of the object.
A line sloping downwards - with a negative gradient - represents an object with a constant deceleration - slowing down.
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