10.2k views
2 votes
This question is typical on some driver's license exams: A car moving at 50 km/h skids

12 m with locked brakes.
How far will the car skid with locked brakes at 150 km/h? Assume that energy loss is due only to sliding friction.
Answer in units of m.

1 Answer

3 votes

Final answer:

The car will skid approximately 36 m with locked brakes at 150 km/h.

Step-by-step explanation:

When a car skids, it undergoes a deceleration due to the friction between the tires and the road. The distance a car skids depends on its initial speed and the coefficient of kinetic friction.

In this case, the car skidded 12 m at a speed of 50 km/h.

To find the distance the car will skid at 150 km/h, we can set up a proportion:

50 km/h / 12 m = 150 km/h / x

Cross multiplying, we get:
50 km/h * x = 150 km/h * 12 m

Simplifying, we find that the car will skid approximately 36 m with locked brakes at 150 km/h.

User Ahmad Vatani
by
8.1k points