Question

Why we are using conservation of mechanical energy here.

Answer 1

Explanation:

mechanical energy is the sum of the potential and kinetic energies . the principal of the conversation of mechanical energy states that the total mechanical energy in a system

Answer 2

Explanation:

Law of conservation of energy is the principle of all the mechanical works. It states that energy cannot be created nor destroyed and total energy in an isolated system remains the same. In mechanical works, generally energies are being transferred from potential energy to kinetic energy, from kinetic energy to thermal energy etc. But the principle is that, when we do some mechanical work there is always conversion of energy from one form to another