To calculate the speed of the object, you can use the formula for speed:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]
In this case, the distance is 10 centimeters and the time is 2 seconds.
\[ \text{Speed} = \frac{10 \text{ cm}}{2 \text{ sec}} = 5 \text{ cm/sec} \]
However, this option does not appear in the responses provided. It seems there might be an error in the options. If we strictly follow the information given, the correct speed is 5 cm/sec.
The options provided (20 cm/sec, 12 cm/sec, 8 cm/sec, 2 cm/sec) do not include the correct answer based on the calculation. Please double-check the question or the options provided.