What is the acceleration due to gravity in SI units?

The correct answer reflects the standard unit of measurement for acceleration due to gravity in the International System of Units (SI). Acceleration is defined as the change in velocity per unit of time, and its unit is meters per second squared (m/s²). In the context of gravity, this value indicates how fast an object accelerates towards the Earth due to gravitational force.

The commonly accepted average value for the acceleration due to gravity at sea level is approximately 9.81 m/s². This means that an object in free fall near the surface of the Earth will increase its velocity by about 9.81 meters per second for every second it falls.

The other options do not correctly represent this value in the right units or magnitude. For instance, simply stating 9.81 m/s does not account for the fact that acceleration also includes a time component in its unit, hence it lacks the necessary squared term. A value of 10 m/s² is a commonly used simplification for calculations but does not represent the precise average value. Lastly, 9.8 m/s² is close and often used as an approximation, but it is not as accurate as the given answer of 9.81 m/s² for precise scientific calculations.