A 1700 kg car travelling at a speed of 15ms skids to a halt, Ask an Expert

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Q. A cooling fan is turned off while it is running at 830-rev/min. It turns 1100 revolutions before it comes to the stop.

What was fan's angular acceleration, supposed constant, and how long did it take to stop?

Q. A 1700 kg car travelling at a speed of 15m/s skids to a halt on wet concrete where f_k =.5. How long is the cars skid marks?

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