Leibniz's derivation was based on the incorrect assumtion that kinetic energy is not conserved.
Geek; you are totally uninformed when it comes to science (and as has been proved a couple of times, you also make stuff up out of thin air, i.e., you lie). Since, the Geek has a lot of trouble understanding what he reads, let's spoon-feed him;
Your claim;
"a) Kinetic energy = mv2 (which is wrong),...."is wrong. Any formulation of kinetic energy which has the kinetic energy proportional to the mass times the velocity squared, is correct. In mathematical terms,
kinetic energy = K * m * v^2
is correct for any positive K, it is all a matter of how you choose your units. The reason that K=1/2 (and the units that go with it) was eventually chosen, is that the 1/2 is necessary if you want the total energy to be conserved (which, of course, you want).
Since, you have based your whole De Pretto argument on a fallacy, the whole argument is clearly wrong.
