– 2 –
sEction a
Answer all the questions in the spaces provided.N07/4/PHYSI/HP2/ENG/TZ0/XX
a1. As part of a road-safety campaign, the braking distances of a car were measured.
A driver in a particular car was instructed to travel along a straight road at a constant speed v.A signal was given to the driver to stop and he applied the brakes to bring the car to rest in as short a distance as possible.The total distance D travelled by the car after the signal was given was measured for corresponding values of v.A sketch-graph of the results is shown below.
v
(a) State why the sketch graph suggests that D and v are not related by an expression of the formD=mv+c,where m and c are constants.[1]............
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