What does the odometer of an automobile measure? Which of the following is moving faster? Justify your answer.
$(i)$ $A$ scooter moving with a speed of $300 \, m$ per minute.
$(ii)$ $A$ car moving with a speed of $36 \, km$ per hour.

(B) The odometer of an automobile measures the distance traveled by the vehicle.
To compare the speeds,we convert both into $m \, s^{-1}$:
$(i)$ Speed of scooter $= 300 \, m / 60 \, s = 5 \, m \, s^{-1}$.
$(ii)$ Speed of car $= 36 \, km/h = 36 \times (1000 \, m / 3600 \, s) = 36 \times (5/18) \, m \, s^{-1} = 10 \, m \, s^{-1}$.
Since $10 \, m \, s^{-1} > 5 \, m \, s^{-1}$,the car is moving faster than the scooter.