and acceleration = velocity change ÷ time. To find the distance travelled, look at the area under the graph. In the first 10 seconds this is the area of the triangle, ½ × 10 s × 40 m/s = 200 m.

2}\). A negative gradient shows the rate of 'slowing down' or deceleration. Velocity-time graphs show velocity on the vertical axis. Acceleration is still represented by the gradient.

Given Bolt’s times for each 10-meter split in the 2008 100-meter race, you can first plot a graph which shows Bolt accelerating ... an equation to these data so that you can calculate Bolt’s velocity ...