Question

When a body falls from height how its mechanical energy remains conserved?

Answer 1

When a body falls down , its mechanical energy is conserved.

Observing by taking ground as referrence level

Initially due to max. height it has max. potential energy , then it gains velocity eith decreasing height so otential energy decreases and kinetic energy increases. At the time just before it strikes ground , it has max. kinetic energy equal to the max potential energy and no potential energy.