The acceleration of a ball when it reaches a height of 36m can be determined using the laws of motion and the concept of free fall. When an object is in free fall near the surface of the Earth and neglecting air resistance, the acceleration due to gravity is approximately constant and equal to 9.8 m/s².
Since the acceleration due to gravity remains constant, the acceleration of the ball when it reaches a height of 36m will also be 9.8 m/s². It does not depend on the specific height at which the ball reaches; gravity's acceleration remains the same throughout the free fall.