How do you find gravitational constant 9.81?

The gravitational constant, often denoted as ( g ), is approximately 9.81 m/s² and represents the acceleration due to gravity at Earth's surface. It can be determined by measuring the acceleration of a freely falling object using a simple pendulum or free-fall experiment. By timing the fall of an object over a known distance and applying the equations of motion, one can calculate ( g ). Variations in ( g ) can occur due to altitude and geographical location, but 9.81 m/s² is the standard value used for calculations at sea level.