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Posted Under: Zong on Sep 3, 2000

It is slippery and a test brake with a speed of 20 km/h results in a braking distance of 8 meters. What braking distance would you expect if the speed were 40 km/h?

Justification

Braking distance changes with the square of the change in speed.

For example:

If the speed is doubled, braking distance is quadrupled (which gives the correct answer, as 8 metres x 4 = 32 metres).

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

If the speed is halved, braking distance is reduced to one fourth. If the speed is halved, braking distance is reduced to one fourth.

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