If a vehicle travels at v=100 km/hv = 100 \text{ km/h}v=100 km/h, what is its acceleration in m/s2\text{m/s}^2m/s2 if it stops in 5 seconds5 \text{ seconds}5 seconds?
5.56 m/s25.56 \text{ m/s}^25.56 m/s2
20 m/s220 \text{ m/s}^220 m/s2
0.55 m/s20.55 \text{ m/s}^20.55 m/s2
2.78 m/s22.78 \text{ m/s}^22.78 m/s2