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+//Example 9.3.efficiency and speed
+clc;
+clear;
+close;
+//given data :
+format('v',5)
+V=600;// in volts
+I=200;//in A
+Ts=20;// in sec
+R=0.1;// in ohm
+E_bse=(V/2)-(I*R);
+E_bp=V-(I*R);
+Tse=(E_bse/E_bp)*Ts;
+Tp=Ts-Tse;
+Vd=V-(2*I*R);
+Mi=((V*I*Tse)/(2*3600))+((V*I*Tp)/3600);
+Er=((Vd/4)*I*(Tse/3600))+(((V/2)/2)*I*(Tp/3600));
+El=(I^2*R*Ts)/(3600);
+Mo=Mi-Er-El;
+eta=(Mo/Mi)*100;
+disp("part (a)")
+disp(eta,"Starting efficiency,(%) = ")
+Vm=80;// in kmph
+alfa=Vm/Ts;
+S=alfa*Tse;
+disp("part (b)")
+disp(S,"speed,S(kmph) = ")