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diff --git a/2780/CH1/EX1.19/Ex1_19.sce b/2780/CH1/EX1.19/Ex1_19.sce
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+clc
+//to calculate velocity of the parcticle 
+c=3*10^8 //light speed(m/s)
+// we know that E(energy)=mc^2
+// mo=rest mass
+//E=3 moc^2=mc^2 or m=3 mo (given that total energy of the particle is thrice its rest energy)  
+m=3 // relativistic mass 
+//formula is v=c sqrt(1-(mo/m)^2)
+v=sqrt(c^2*(1-(1/m)^2))
+disp("velocity of the particle is v="+string(v)+"m/s")