The average speed of an object is calculated using the formula:
\[ \text{Average Speed} = \frac{\text{Total Distance}}{\text{Total Time}} \]
In this case, the object moves a distance of 10 meters in 5 seconds. Plugging in the values:
\[ \text{Average Speed} = \frac{10 , \text{meters}}{5 , \text{seconds}} = 2 , \text{m/s} \]
Therefore, the average speed of the object is 2.0 m/s.
The correct answer is b) 2.0 m/s.