To calculate the average speed of the object, we use the formula:
\[ \text{Average Speed} = \frac{\text{Total Distance}}{\text{Total Time}} \]
In this case, the total distance is 10 meters and the total time is 5 seconds. Plugging in the values:
\[ \text{Average Speed} = \frac{10 \text{ m}}{5 \text{ s}} = 2 \text{ m/s} \]
So, the average speed of the object is 2.0 m/s.
The correct answer is:
a) 2.0 m/s.