A rule states that the friction between dry concrete and a sliding car's tyre is equal to nine-tenth of the car's weight. If the skid marks left by a car coming to rest are 20 m long, how fast was the car going before the brakes were applied?
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A rule states that frictional force between dry concrete and a sliding car's tyre is equal to nine tenth of the car's weight.
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a rule states that the friction between dry concrete and a sliding cars tyre is equal to nine tenth of the cars weight
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