Err I think you got your physics wrong.
change in speed due to gravitational accelleration varies with the square roort of the distance travelled.
v^2-u^2=2as after all. So if dropped from stationary speed u=0 so v^2=2as or v=sqrt(2as) given a is constant.
Therefore energy is proportional to the height dropped from.
So no if dropped from 5 times higher the energy is five times more.
