If she hits the brakes, how far will she travel before stopping?

  • Thread starter rakesh44
  • Start date
  • #1
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Homework Statement


A person driving her car at 56 km/h approaches an intersection just as the traffic light turns yellow. She knows that the yellow light lasts only 2.0 s before turning to red, and she is 30 m away from the near side of the intersection (Fig. 2-29). Should she try to stop, or should she make a run for it? The intersection is 15 m wide. Her car's maximum deceleration is -5.6 m/s2, whereas it can accelerate from 56 km/h to 70 km/h in 4.2 s. Ignore the length of her car and her reaction time. If she hits the brakes, how far will she travel before stopping?


Homework Equations


can someone at least give me a formula that i can use to find the answer??
thankss
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
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Refer any text book and list the kinematic equations.
 

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