Question

what is congervation of energy?explain with an example

Answer 1

According to the conservation of energy, energy can neither be created nor be destroyed. Example is a freely falling object.
It's total energy at any point is mgh.

Answer 2

Conservation of energy, principle of physics according to which the energy of interacting bodies or particles in a closed system remains constant. The first kind of energy to be recognized was kinetic energy, or energy of motion. In certain particle collisions, called elastic, the sum of the kinetic energy of the particles before collision is equal to the sum of the kinetic energy of the particles after collision.

it's conservation of energy