A traffic ticket.pdf

# A traffic ticket.pdf - A trac ticket(solution 3.2.2.P7 ....

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A traﬃc ticket (solution) 3.2.2.P7 A commuter travels to work along a road with many traffic signals. After stopping at one red light the commuter accelerates at 2 m/s 2 . Just as he passes a speed camera, he notices that the next traffic light has turned red and he must stop, which he does by reversing his acceleration and now decelerating at a constant rate of 2 m/s 2 ; coming to a stop just at the traffic light. The distance between the two traffic lights is 800 m. A. How does the time he is speeding up compare to the time he is slowing down? Explain your reasoning. B. How long does he take to get from the first traffic light to the second? Image by E Redish with permission. C. The speed limit on the road is 30 mi/h. If he is going more than about 15 mi/h faster than that, he’ll get a traffic ticket in the mail. Do you expect him to get one? Show by explicit calculation. (Useful conversion factor: 1 m/s = 2.24 mi/h.) A. Since he just reverses his acceleration, he must spend the same amount of time speeding up as slowing down. He will take the same amount
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• Summer '16
• David Buehrle

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