This value is very close to the standard acceleration due to gravity (9.80665 m/s²), which is an average value used for calculations.
Here's why it's slightly different:
* Latitude: Gravity is slightly weaker at the equator and stronger at the poles. London is closer to the pole than the equator.
* Altitude: Gravity decreases with increasing altitude. London is not at sea level, so its gravity is slightly less than the standard value.
* Local Density Variations: The density of the Earth's crust can also slightly affect gravity.
However, these variations are small, and for most practical purposes, the value of 9.81 m/s² is accurate enough.
