initial commit / add all books

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+//To calculate velocities after a two particle head on collision

+//Vf = velocities after collision

+//**Already defined variables**

+//e = newton's constant for collision

+//m1&m2 = masses of the particles

+//Vi = initial velocities of the particle

+function [f] = collision(Vf)

+    f=zeros(2,1);

+    //newton's equation for collision

+    f(2)= e*(Vi(1)-Vi(2))-(Vf(2)-Vf(1));

+    //Momentum conservation

+    f(1)=(m1*Vi(1)+m2*Vi(2))-(m1*Vf(1)+m2*Vf(2))

+endfunction
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