Final answer:
The gain in speed each second for a freely falling object is approximately 9.8 m/s², which is the acceleration due to gravity.
Step-by-step explanation:
The gain in speed each second for a freely falling object is approximately 9.8 m/s², which is option A). This value represents the acceleration due to gravity, which is the rate at which the object's velocity increases as it falls under the influence of gravity.