Yes, my calculation considers the decrease in gravity when the ball is farther way from the surface of the planet. The gravitational acceleration used in the calculation is based on the distance between the ball and canter of the planet, which changes as the ball moves away from the surface of the planet. The gravitational field equation gives the magnitude of the gravitational acceleration as a function of the distance from the center of the mass that causes the acceleration. The gravitational potential energy increases as the planet moves farther away, and the speed and kinetic energy of the ball decreases.
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