Asked by anshuman kumar
11. In an accident a freeway sports car made skid marks 200 m long along the pavement. The police estimated the braking acceleration of the car to be – 0.8g under the road conditions prevailing. Determine the speed of the sports car when the brakes were applied.
Answers
Answered by
drwls
Kinetic energy loss equals work done against skidding friction. The mass M cancels out.
The friction force F can be deduced from the mass and acceleration.
(M/2) V^2 = (0.8g)*M*X
V^2 = 1.6 *g*200
V = 56 m/s = 201.6 km/s = 125 mph
The friction force F can be deduced from the mass and acceleration.
(M/2) V^2 = (0.8g)*M*X
V^2 = 1.6 *g*200
V = 56 m/s = 201.6 km/s = 125 mph
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