Question

is acceleration due to gravity uniform

Answer 1

The acceleration which is gained by an object because of gravitational force is called its acceleration due to gravity. Its SI unit is m/s2. Acceleration due to gravity is a vector, which means it has both a magnitude and a direction. The acceleration due to gravity at the surface of Earth is represented as g. It has a standard value defined as 9.80665 m/s2
It is uniform between certain distances.
It doesnt matter how long you fall down, the acceleration will always be thesame between a certain distance.

Generally, the closer you get, the stronger the gravitational pull is. and vice versa.