Question

Arrange the following speeds in increasing order (keeping the least speed first):

(i) An athlete running with a speed of 10 m/s.
(ii) A bicycle moving with a speed of 200 m/min.
(iii) A scooter moving with a speed of 30 km/h.

Answer 1

We have three different moving bodies. To compare their speeds, we need to express them in similar S.I. units.
(i) An athlete running with a speed of 10 m/s.
(ii) A bicycle moving with a speed of 200 m/min. Converting into S.I. units, the speed will be:
$$\begin{gathered} =\frac{200}{60} \\ =3.33\mathrm{m}/\mathrm{s} \end{gathered}$$
(iii) A scooter moving with a speed of 30 km/h. Converting into S.I. units, the speed will be:
$$\begin{gathered} =\frac{\left(30\right)\left(1000\right)}{3600} \\ =8.33\mathrm{m}/\mathrm{s} \end{gathered}$$
On arranging the speeds in ascending order, we get:
(ii) < (iii) < (i)