In physical sciences, mechanical energy is the sum of potential energy and kinetic energy. It is the macroscopic energy associated with a system. The principle of conservation of mechanical energy states that if an isolated system is subject only to conservative forces, then the mechanical energy is constant.
You have to change both fractions to their least common denominator. 3/5 would = 9/15 and 2/3 would equal 10/15. You add the two together and you get 19/15 or
