If an object moves along a straight line, the distance travelled can be represented by a distance-time graph. In a distance-time graph, the gradient of the line is equal to the speed of the object. The greater the gradient (and the steeper the line) the faster the object is moving.
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Speed = distance ÷ time
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Distance = speed × time
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Time = distance ÷ speed
To calculate one of the variables (speed, distance or time) we need the other two.
