Why acceleration due to gravity does not changes when earth stops rotating?

Answer 1

Well first of all, you don't know that to be true, because the Earth has never

stopped rotating to let us observe what happens.

But we do know that the statement is true. The deceptively simple formula for

calculating the gravitational force between two masses tells us that the force

depends on the masses and the distance between them. The fact that they

may be rotating, tumbling, flopping around, orbiting in a giant ellipse, or sailing

through the blue doesn't appear in the formula, because none of that makes any

difference in the forces of gravity.

Answer 2

The acceleration due to gravity is determined by the mass of the Earth and the distance from the center of the Earth. The Earth's rotation does not affect these factors, so the acceleration due to gravity remains constant regardless of whether the Earth is rotating.