@DaLo
At your link "http://physics.stackexchange.com/questions/45578/is-two-cars-colliding-at-50mph-the-same-as-one-car-colliding-into-a-wall-at-100" we read the following note at the end of the thread:
"Thank you for your interest in this question. Because it has attracted low-quality answers, posting an answer now requires 10 reputation on this site."
So, not terribly helpful.
Biting the hand that feeds IT
