A stop watch has 10 divisions graduated between the 0 and 5 s marks. What is its least count?

Explanation

To find the least count of the stopwatch, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Range of the Stopwatch**:
The range of the stopwatch is the difference between the maximum and minimum time it can measure. In this case, the stopwatch measures from 0 seconds to 5 seconds.
\[
\text{Range} = \text{Maximum} - \text{Minimum} = 5 \, \text{s} - 0 \, \text{s} = 5 \, \text{s}
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