How can potential energy be transformed

When an object falls, its gravitational potential energy is changed to kinetic energy. You can use this relationship to calculate the speed of the object's descent. Gravitational potential energy for a mass m at height h near the surface of the Earth is mgh more than the potential energy would be at height 0.

Well put it likee this example beloww . ↓ Watchh .
  The apple is sitting on the tree right at Potential Energy right ok, the potential energy is transformed in to kinetic energy as the apple falls onto the ground, this logical explanation should help you out a lil.

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4) repetitive change