... well the quadratic function fits the original speed of the test run car. Method & Calculations Information from the 'car test run line graph' Q1. The maximum speed reached by the car is 67.5mph. It took 14.8s for the car to reach this speed. I have worked the maximum speed of the car by looking at the peaks of the graph (maximum speed is the highest peak of the graph), then I read the time and speed from the corresponding axis V= speed and t = time. For the car to reach 60mph it took 10.7s. I found this by taking reading from the V-axis at 60mph. During that time the car accelerated at 5.61 mph (acceleration = speed/time). Q2. The car changed gear at least three times. I have worked this out by looking at the graph, where the line is flat only for few seconds. I know this because when a gear change ...

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