In physics, gravitational acceleration is the free fall acceleration of an object in vacuum — without any drag. This is the steady gain in speed caused exclusively by the force of gravitational attraction. At given GPS coordinates on the Earth’s surface and a given altitude, all bodies accelerate in vacuum at the same rate. This equality is true regardless of the masses or compositions of the bodies.
At different points on Earth surface, the free fall acceleration ranges from 9.764 m/s2 to 9.834 m/s2 depending on altitude and latitude, with a conventional standard value of exactly 9.80665 m/s2 (approximately 32.17405 ft/s2). This does not take into account other effects, such as buoyancy or drag – WIKIPEDIA