Working your numbers to energy

5 tons traveling at 509 km/h = 0.5 * 5000 * 141.389 * 141.389 = 49.97MJ

1 ton traveling at 2545 km/h = 0.5 * 1000 * 706.9444 * 706.9444 = 249.88MJ

1 kg traveling at 295,000 km/h = 0.5 * 1 * 81944.4444 * 81944.4444 = 3357MJ

Not one of those contain the same energy, you can't simply divid the mass and multiply the speed as there is a square in there. You went from 50MJ to 3357MJ (if my maths is right and calculator working smile)

That is why as they say speed kills in a car crash the energy is a square of the speed.

You are holding the momentum the same but not the energy if you divid one and multiply the other by two. The last case would do significantly more damage if it ran into anything.

Last edited by Orac; 12/23/15 01:57 AM.
I believe in "Evil, Bad, Ungodly fantasy science and maths", so I am undoubtedly wrong to you.