Question14. If a car accelerates at $9 \mathrm{~m/s}^2$, how long to reach $63 \mathrm{~m/s}$?
15. With $5 \mathrm{~m/s}^2$ acceleration, what speed after $10 \mathrm{~s}$?
16. In which direction are the horses moving?
17. Which horse is speeding up and which is slowing down?