Save guides, add subjects and pick up where you left off with your BBC account. Acceleration close accelerationThe rate of change in speed (or velocity) is measured in metres per second squared.

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.