Question

Which of the following is/are the units of speed?

• A. $\frac{metre}{second}$
• B. $\frac{kilogram}{second}$
• C. $\frac{second}{metre}$
• D. $\frac{kilometre}{hour}$

Answer 1

Answer: (A), (D)

The correct options are
A $\frac{metre}{second}$
D $\frac{kilometre}{hour}$

Speed is defined as the distance travelled by any object in unit time.
$Speed=\frac{distance}{time}$
Speed is expressed in the units of distance and time. Since the SI unit of distance is metre and that of time is second, the unit of speed is:
$Speed=\frac{distance\left(metre\right)}{time\left(second\right)}$
Sometimes it is convinient to use the unit of distance as kilometre and time as hour. Thus speed is also expressed as
$Speed=\frac{distance\left(kilometer\right)}{time\left(hour\right)}$