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Consider the street pattern shown in Fig. $2-42 .$ Each intersection has a traffic signal, and the speed limit is 50 $\mathrm{km} / \mathrm{h}$ . Suppose you are dr...

Question

Consider the street pattern shown in Fig. $2-42 .$ Each intersection has a traffic signal, and the speed limit is 50 $\mathrm{km} / \mathrm{h}$ . Suppose you are driving from the west at the speed limit. When you are 10 $\mathrm{m}$ from the first intersection, all the lights turn green. The lights are green for 13 s each. (a) Calculate the time needed to reach the third stoplight. Can you make it through all three lights without stop- ping? (b) Another car was stopped at the first light when al

Consider the street pattern shown in Fig. $2-42 .$ Each intersection has a traffic signal, and the speed limit is 50 $\mathrm{km} / \mathrm{h}$ . Suppose you are driving from the west at the speed limit. When you are 10 $\mathrm{m}$ from the first intersection, all the lights turn green. The lights are green for 13 s each. (a) Calculate the time needed to reach the third stoplight. Can you make it through all three lights without stop- ping? (b) Another car was stopped at the first light when all the lights turned green. It can accelerate at the rate of 2.0 $\mathrm{m} / \mathrm{s}^{2}$ to the speed limit. Can the second car make it through all three lights without stopping?



Answers

Consider the street pattern shown in Fig. $2-42 .$ Each intersection has a traffic signal, and the speed limit is 50 $\mathrm{km} / \mathrm{h}$ . Suppose you are driving from the west at the speed limit. When you are 10 $\mathrm{m}$ from the first intersection, all the lights turn green. The lights are green for 13 s each. (a) Calculate the time needed to reach the third stoplight. Can you make it through all three lights without stop- ping? (b) Another car was stopped at the first light when all the lights turned green. It can accelerate at the rate of 2.0 $\mathrm{m} / \mathrm{s}^{2}$ to the speed limit. Can the second car make it through all three lights without stopping?


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