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+//Example number 6.9, Page number 120
+
+clc;clear;
+close;
+
+//Variable declaration
+Ee=10;     //electron kinetic energy(eV)
+Ep=10;     //proton kinetic energy(eV)
+e=1.6*10**-19;      //charge(c)
+me=9.1*10**-31;      //mass(kg)
+mp=1.67*10**-27;     //mass(kg)
+//Calculation
+cebar=sqrt(2*Ee*e/me);    //electron velocity(m/s)
+cpbar=sqrt(2*Ep*e/mp);    //proton velocity(m/s)
+//Result
+printf("electron velocity is %.3e m/s",cebar)
+printf("\n proton velocity is %.3e m/s",cpbar)
+//answers given in the book are wrong