Chapter 2, Problem 1OQ

To determine

The average speed of the car.

Answer to Problem 1OQ

Option (b) $24\text{m}/\text{s}$.

Explanation of Solution

There are five intervals between the initial and final and starting from the first drop. The each interval is 5 seconds. Therefor the total time taken by the car is 25 seconds.

The distance between the initial and final drop of oil is $600\text{m}$.

Write the expression to calculate the average speed of the car.

  $v=\frac{d}{t}$

Here, v is the average speed, d is the total distance and t is the total time taken.

Conclusion:

Substitute $25\text{s}$ for t and $600\text{m}$ for d in the above equation to calculate v.

  $\begin{array}{c}v=\frac{600\text{m}}{25\text{s}}\\ =24\text{m}/\text{s}\end{array}$

Therefore, option (b) is correct.