Lai was driving north on Hwy 75 with a speed of 56.9 m/s when she heard on a CB that a patrolman was hiding 127.3 m north of where she is. Knowing that the patrolman can start clocking the car in 2.7 seconds, Lai decided to slow to 34.2 m/s. and immediately pressed on the brakes. Assuming that the car reaches 34.2 m/s at the end of the 2.7 seconds, what is in m/s2 the car's acceleration? (don't include units in your answer)
