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A driver in a 1000 kg car traveling at 13 m/s slams on the brakes and skids to a stop. if the coefficient of friction between the tires and the horizontal road is 0.80, how long will the skid marks be?
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Mar 9, 2019
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A driver in a 1000 kg car traveling at 13 m/s slams on the brakes and skids to a stop. if the coefficient of friction between the tires and the horizontal road is 0.80, how long will the skid marks be?
Physics
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Kousalya
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Using F = ma to the direction of travel;
-F = 1000 * a
-F is due to the reverse direction of the frictional force.
F = 0.8 * 1000 * 9.81 = 7250 N
-7850 = 1000 * 9
9 = -7.85m/s^2
Using V^2 = U^2 + 2aS to the direction of trabel
0 = 20^2 + 2(-7.85)S
S = 25.5m
So the skid marks will be there for 25.5 which estimated is 26m.
The correct answer is 26m.
I hope this helps you out!
Stefan Nuxoll
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Mar 13, 2019
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Stefan Nuxoll
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