As the mango falls from the tree, it initially has a high potential energy due to its position above the ground. As it starts to fall, this potential energy is converted into kinetic energy, which is the energy of motion. The mango's speed increases as it falls, and its potential energy decreases while its kinetic energy increases.
At the moment the mango hits the ground, all of its potential energy has been converted into kinetic energy. This interchange between potential and kinetic energy is a result of the force of gravity acting on the mango as it falls.