To find the average speed of the object, you can 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.
So, the average speed is:
\[ \text{Average speed} = \frac{10 \text{ meters}}{5 \text{ seconds}} = 2 \text{ m/s} \]
Therefore, the correct answer is:
d) 2.0 m/s