why object gains potential energy when kept at height but has no potential energy energy when kept at ground

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We say that gravitational potential energy is zero when the object is on the ground(earth surface). My doubt is that can gravitational potential energy be considered zero anywhere (at any altitude) when object is kept on the surface of earth? And also there is distance between the object and the centre of the earth, how can the gravitational potential energy be considered zero?

Q. Find the gravitational potential energy of a

1 k g

mass kept at a height of

5 m

above the ground if

g = 10 m s^{- 2}

Q. A body of weight 1 newton has a potential energy of 1 joule relative to the ground when it is at a height of:

Q. A body of mass 2 kg has a potential energy of 800 J when it is at a certain height. If it begins to fall, its velocity when its Kinetic energy and Potential energy are equal is

Find the gravitational potential energy of 2.5 kg mass kept at a height of 15 m above the ground. The force of gravity on mass 1 kg is 10 N.

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