While driving her new fuel efficient mini-car, Zelda changes her velocity from 22 km/h [forward] to 85 km/h [forward] while driving 2.0 × 102 m. What is her average acceleration ?

Answer 1

22,000/3600 = 6.11 m/s
85 000/3600 = 23.61 m/s

average speed during acceleration = 14.86 m/s

t = distance/speed = 200/14.86 = 13.46 s

a = speed change/time = 17.5/13.46 = 1.3 m/s^2