Ответ. m*u1=2*m*u3; u3=0,5*v1; 0,5*m*u1^2=m*u3^2+Q2; Q2=0,5*m*u1^2-m*u3^2; Q2=0,5*m*u1^2-0,25*m*u1^2;
u1=2*(Q2/m)^0,5; m*v=m*u1+m*u2; u2=v-u1;0,5*m*v^2=0,5*m*u1^2+0,5*m*u2^2+Q; 0,5*m*v^2=0,5*m*u1^2+0,5*m*(v-u1)^2+Q; Q=0,5*m*v^2-0,5*m*u1^2-0,5*m*(v-u1)^2; Q=0,5*m*(v^2-u1^2-(v-u1)^2);
Q=0,5*m*(v^2-u1^2-v^2-u1^2+2*v*u1);Q=0,5*m*(-2*u1^2+2*v*u1);Q=m*u1*(v-u1);Q=m*(2*(Q2/m)^0,5)*(v-2*(Q2/m)^0,5);