October 13, 2015

Homework Help: physics

Posted by george on Monday, February 4, 2013 at 8:33am.

A person driving her car at 56km/hr approaches an intersection just as the traffic light turns yellow. She knows that the yellow light lasts only 20.s before turning to red, and she is 30m away from the near side of the intersection. The intersection is 15m wide. Her car's maximum deceleration is -6.2m/s^2, whereas it can accelerate from 56km/hr to 70km/hr in 4.2s. Ignore the length of her car and her reaction time.
a.) if she hits the brakes, how far will she travel before stopping?
b.) if she hits the gas instead, how far will she travel before the light turns red?
c.) should she try to stop or should she speed up to cross the intersection before the light turns red?

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