Work, Power And Energy — Science STD 9 — Question

Since the ball is in free-fall, the only force acting on it is gravity. Therefore, we can use the principle of conservation of mechanical energy - initially the ball has potential energy and no kinetic energy. As it falls, its total energy (the sum of the $KE$ and the $PE)$ remains constant and equal to its initial $PE.$ when reaches the ground there is no $PE$ only $KE\ I.E.,$ Equal to initial $PE$