While driving down Zelzah on your way to school you notice that campus police are hiding at the entrance to the high school and you are traveling at 30 m/s, you only have 20 meters to reach the speed limit of 35 mi/hr. What acceleration would you experience in order to accomplish this?

Question

While driving down Zelzah on your way to school you notice that campus police are hiding at the entrance to the high school and you are traveling at 30 m/s, you only have 20 meters to reach the speed limit of 35 mi/hr.  What acceleration would you experience in order to accomplish this?

oobleck · Answer

35 mi/hr = 15.65 m/s 30 + at = 15.65 t = -14.35/a 30t + 1/2 at^2 = 20 30(-14.35/a) + 1/2 a (-14.35/a)^2 = 20 a = -16.377 m/s^2