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Posted Under: Zong on Sep 3, 2000


Question 896 of 1002

If you have a braking distance of 8 meters when your speed is 40 km/h, the braking distance would be ...
Justification

The braking distance changes in proportion to the square of the change in speed.

E.g.:

If the speed is doubled, braking distance is quadrupled.

If the speed is tripled, braking distance is multiplied by nine.

If the speed is halved, braking distance is reduced to one fourth (which gives the correct answer for this question, as 8 m / 4 = 2 m). If the speed is halved, braking distance is reduced to one fourth (which gives the correct answer for this question, as 8 m / 4 = 2 m).
Options
9 times shorter if you were driving at 20 km/h
2 meters if you were driving at half the speed
4 meters if you were driving at half the speed
6 meters if you were driving at 20 km/h




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