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We can use graphs to help us describe the motion of an object.  A distance-time graph shows us the distance an object has travelled from a starting point (along the y-axis) against the time taken (along the x-axis).  The speed of an object is the distance travelled each second.  The gradient of the line on a distance-time graph represents the speed.  The steeper the gradient, the greater the speed.  If an object is stationary, the line on a distance-time graph is horizontal.  We can calculate the speed of an object using the equation:

Speed (m/s) = Distance travelled in metres / Time taken in seconds



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