Đáp án:
em tham khảo nhé
Có \({v_0} = 60km/h = \dfrac{{50}}{3}m/s.\)
\(\begin{array}{l} \Rightarrow a = \dfrac{{{0^2} - {{(\dfrac{{50}}{3})}^2}}}{{2.20}} = \dfrac{{125}}{{18}}m/{s^2}.\\t = \dfrac{{0 - \dfrac{{50}}{3}}}{{\dfrac{{125}}{{18}}}} = 2,4s.\end{array}\)