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

[rakesh44]

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

 

[rl.bhat]

Refer any textbook and list the kinematic equations.