Chapter 2, Problem 3STP

To determine

To Choose: The correct option.

Answer to Problem 3STP

A correct answer is an option (C).

Explanation of Solution

Given:

From above graph, it is found that,

Distance travelled by the cyclist is $d=5\text{km}$ .

Initial speed of the cyclist is $0\text{km/h}$ .

Formula used:

The average speed is

  $s=\frac{d}{t}$ ........ (1)

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

Calculation:

The speed of the cyclist is zero at a distance of 3 km and 5 km after starting of the journey. The graph indicates the speed is zero at this point of distance on the x axis. So the options (a), (B), and (D) are wrong.

The cyclist has speed zero at two locations in the graph given above. So, option (C) is correct answer.

Conclusion:

Hence, the cyclist stopped 2 times.