
Concept explainers
To Draw: A velocity-time and a position-time graph one above the other on the same time scale to represent the given motion of a sprinter.
To Indicate: The starting blocks and finish line are on position-time graph.

Explanation of Solution
Given:
A sprinter walks at constant speed up to starting blocks. She accelerates until attains a constant velocity, after hearing the starting pistol go off. She slows down to a walk after she crosses to the finish line (maintaining the same velocity). After that she speeds up at beginning.
Graph:
AB represents sprinter walks up to the starting blocks at a constant speed.
CD represents she accelerates rapidly and attains a constant velocity.
DE represents she maintains this constant velocity
EF represents she crosses the finish line, and then slows down to a walk
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