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+//Example 10.4: Energy returned to the line
+clc;
+clear;
+close;
+//given data :
+W=2340;//in tonne
+We=1.1*W;// in tonne
+G=100/80;// gradient in %
+eta=70/100;// efficiency
+V1=60;// in km
+V2=36;// in km
+r=5*9.81;//N/tonne
+t=5*60;// in sec
+Ea=(0.01072*We*(V1^2-V2^2))*10^-3;// in kWh
+Ft=(W*r)-(98.1*W*G);//tractive effort in N
+D=((V1+V2)/2)*(1000/3600)*t;// distance moved in m
+M=(-Ft*D)/(1000*3600);
+Et=Ea+M;
+El=eta*Et;
+disp(El,"Energy returned to the line,El(kWh) = ")