What type of motion is represented by the following ?
Hands of an athlete in a race.

Answer

**Step-by-Step Solution:**

1. **Understanding the Context**: The question asks about the type of motion represented by the hands of an athlete during a race. When an athlete runs, they often move their arms to help with balance and momentum.

2. **Analyzing the Motion of the Hands**: As the athlete runs, their hands move back and forth in a rhythmic manner. This movement is not linear, as the hands do not move in a straight line but rather follow a path that can be described as circular.

3. **Identifying the Type of Motion**: The hands of the athlete can be seen as moving in a circular path around the shoulder joint. This is because the shoulder acts as a pivot point, and the hands swing in a circular arc as the athlete runs.

4. **Conclusion**: Therefore, the type of motion represented by the hands of an athlete in a race is circular motion.

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