Question

13. a) State the law of conservation of energy. b)Consider a free fall body and prove that mechanical energy is always conserved for any three

points (A,B,C) . ​

Answer 1

In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. ... For systems which do not have time translation symmetry, it may not be possible to define conservation of energy.