Question

Why value of g is 9.81 at sea level

Answer 1

Near Earth's surface, gravitational acceleration is approximately 9.8 m/s2, which means that, ignoring the effects of air resistance, the speed of an object falling freely will increase by about 9.8 metres per second every second. ... The precise strength of Earth's gravity varies depending on location.                                                                                                                                           HOPE THIS HELPS !!