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Calculating the speed of a car
The presenter talks to a policeman about how the speed of a car is calculated. They look at how fixed marks and known distances are used to calculate speed. This is done by measuring the time it takes a vehicle to travel the known distance, and then using the formula speed = distance / time to calculate the speed. This same method is used on the two pictures from a speed camera which show how many fixed marks a vehicle passes in half a second.
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