This question is typical on some driver’s license exams: A car moving at 45 km/h skids 12 m with locked brakes. How far will the car skid?

This question is typical on some driver’s license exams: A car moving at 45 km/h skids
12 m with locked brakes.
How far will the car skid with locked brakes
at 90 km/h? Assume that energy loss is due
only to sliding friction.
Answer in units of m.
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