// E(s) = E0 - constant * s, constant = area of bullet circle * material constant / mass
Es_m = E0_m - constant * dst;
if(Es_m <= 0)
// E(s) = E0 - constant * s, constant = area of bullet circle * material constant / mass
Es_m = E0_m - constant * dst;
if(Es_m <= 0)