Chapter SH, Problem 2.5APP

To determine

To Calculate: The average speed.

Answer to Problem 2.5APP

The average speed is $\text{23}\text{.5 m/s}$ .

Explanation of Solution

Given data:

Total distance $=550\text{ km}$

Total time $=6.5\text{ h}$

Formula used:

  $\text{average speed}=\frac{\text{total distance}}{\text{total time}}$

Calculation:

As per the problem,

Total distance $=550\text{ km}=550000\text{ m}$

  $\left[1\text{ km}=1000\text{ m}\right]$

Total time $=6.5\text{ h}=6.5\text{ h}\times \frac{3600\text{ s}}{1\text{ h}}=23400\text{ s}$

  $\left[\text{1 h}=3600\text{ s}\right]$

Putting the values of total distance and total time in the average speed-formula

  $\begin{array}{l}\text{average speed}=\frac{\text{total distance}}{\text{total time}}\\ \text{average speed}=\frac{550000\text{ m}}{\text{23400 s}}=23.5\text{ m/s}\end{array}$

Conclusion:

The average speed is $\text{23}\text{.5 m/s}$ .