Đáp án:
$v_1 = 50m/ph = \dfrac{5000cm}{60s} = \dfrac{2500}{3}cm/s$
$v_2 = 260m/phút = \dfrac{26000cm}{60s} = \dfrac{1300}{3}cm/s$
$v_3 = 156m/phút = \dfrac{\dfrac{156}{1000}km}{\dfrac{1}{60}h} = 9,36km/h$
$v_4 = 1,8km/min = \dfrac{1800m}{60s} = 30m/s$
$v_5 = 5,8m/min = \dfrac{580cm}{60s} = \dfrac{29}{3}cm/s$
$v_6 = 1,8km/h = \dfrac{1800m}{60min} = 30m/min$
$v_7 = 25dm/s = \dfrac{\dfrac{25}{10}}{1s} = 2,5m/s$
$v_8 = 12m/h = \dfrac{1200cm}{60min} = 20cm/min$
Giải thích các bước giải: