# Pyshics

13. A car traveling at 60 km/h will skid 30 m when its brakes are locked. If the same care is traveling at 180 km/h, what will be the skidding distance? Be sure to show all work to support your answer.

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1. since the distance is proportional the the square of the speed,

3*speed ==> 9*distance

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posted by Steve
2. triple the speed, increase distance by 9x

distance=9*30

reason:
work done=KE
friction*distance=1/2 m v^2
so distance is proportional to v^2

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3. Interesting, how showing your work means showing the work!

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posted by Steve

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