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+//Example 10.3: Electrical energy and average power
+clc;
+clear;
+close;
+//given data :
+format('v',6)
+W=400;//in tonne
+We=1.1*W;// in tonne
+S=2;// distance in km
+G=2;// gradient in %
+eta=75/100;// efficiency
+D=2;// distance in km
+V1=40;// in km
+V2=20;// in km
+r=40;//N/tonne
+Ea=(0.01072*We*(V1^2-V2^2))*10^-3;// in kWh
+Ft=(W*r)-(98.1*W*G);
+M=(-Ft*S*1000)/(1000*3600);
+Et=Ea+M;// total energy available
+Ee=eta*Et;
+disp(Ee,"Electrical energy,Ee(kWh) = ")
+As=(V1+V2)/2;// average speed
+At=D/As;// Average time taken
+P=round(Ee/At);
+disp(P,"Average power,P(kW) = ")