What is the standard acceleration due to gravity near Earth's surface?

• A. Approximately 9.8 m/s^2.
• B. Approximately 9.81 m/s^2.
• C. Approximately 9.8 m/s^2.
• D. Approximately 10 m/s^2.

Answer: (C)

Gravity near Earth's surface is treated as a nearly constant acceleration, called g, that a freely falling object with no air resistance would experience. For most introductory problems, we use a rounded value of 9.8 m/s^2. This keeps calculations simple while staying close to the real average, since the true mean is about 9.80665 m/s^2 and g varies slightly with location and altitude (roughly from about 9.78 to 9.83 m/s^2 depending on where you are). Among common choices, 9.8 m/s^2 represents the standard classroom value because it balances accuracy with ease of use. A more exact figure like 9.81 m/s^2 is also used in some contexts, but the rounded 9.8 m/s^2 is the typical convention here. The option 10 m/s^2 would be too crude for precise work.