* Acceleration due to gravity: A freely falling object accelerates at approximately 9.8 m/s². This means its speed increases by 9.8 meters per second every second.

* Calculating the speed: After 10 seconds, the object's speed will be:

* Speed = acceleration * time

* Speed = 9.8 m/s² * 10 s = 98 m/s

Therefore, the closest answer is 100 m/s.