Chapter 2, Problem 11STP

To determine

To identify: the swimmer that had the highest average speed over the time interval of 30 min.

To explain: above the phenomenon.

Answer to Problem 11STP

Swimmer C has the greatest average speed over the given time interval.

Explanation of Solution

Given:

The given distance vs. time graph is shown below

  

Formula used:

The average speed is

  $s=\frac{d}{t}$  ...... (1)

Here, $d$ and $t$ are distance and time taken to travel.

Calculation:

The slop of the distance-time graph is the speed of the runner. From the graph, it is found that the slope of swimmer C is greater than other swimmers. This represents that the average speed of swimmer C is greatest over the time interval of 30 min.

Conclusion:

Hence, swimmer C has the greatest average speed over the given time interval.