Two cars, A and B, are moving at speeds of 15 m·s-1 and 30 m·s-1 in the same
direction. They are side by side when both drivers observe an obstruction ahead of
them, as shown in the diagram below.
Both drivers apply their brakes and accelerate at –4,5 m·s-2 until both cars come to
rest. Ignore the reaction time of the drivers.
4.1 Define the term acceleration in words. (2)
4.2 Calculate the:
4.2.1 Time it takes car A to come to rest (4)
4.2.2 Stopping distance of car A (4)
4.3 Which car (A or B) has the longer stopping distance? Support the answer with
a calculation. (6)
4.4 What conclusion can be made about the relationship between speed and
stopping distance? (2)
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