A 1000kg car is going 20 m/s on a level road. The driver sees a deep crevice
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A 1000kg car is going 20 m/s on a level road. The driver sees a deep crevice

[From: ] [author: ] [Date: 12-04-04] [Hit: ]
KE = 0.KE = 200,200,D = 25.Yes, car stops in time-Invalid question-cars cant go 20m/s on a crevice ridden road!......
50m in front of him. He slams on the brakes and skids towards the crevice. The coefficient of the friction between the car and the road is µ = 0.8.

How far does the car skid? Does the car go into the crevice?

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F_friction = Mu * F-Normal

F_n = MA = 1000 kg * 9.8 m/s^2 = 9800 N

F_f = 0.8 * 9800 = 7840 N

KE = 0.5MV^2
KE = 0.5 * 1000 * 20^2
KE = 200,000 J

KE = Work

Work = Force * distance

200,000 = 7840 N * D

D = 25.51 m

Yes, car stops in time

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Invalid question- cars can't go 20m/s on a crevice ridden road!
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