Question 5 - Horse vs Train Speed Comparison - Questions at the end of the chapter - Chapter 8 Class 7 - Measurement of Time and Motion (Curiosity)

Question. The fastest galloping horse can reach the speed of approximately 18 m/s. How does this compare to the speed of a train moving at 72 km/h?

Answer.

Convert 72 km/h to m/s:

$$\begin{aligned} 72 \text{ km/h} &= 72 \times \frac{5}{18} \text{ m/s} \\[8pt] &= 20 \text{ m/s} \end{aligned}$$

Comparing the two:

• Horse
  18 m/s
• Train
  20 m/s

The train is faster by 20 − 18 = 2 m/s .