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diff --git a/629/CH11/EX11.9/example11_9.sce b/629/CH11/EX11.9/example11_9.sce
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+clear
+clc
+//Example 11.9 NEGATIVE LIFT ON A RACE CAR
+l=1.5; //[m]
+c=0.25; //[m]
+A=l/c //aspect ratio
+//Interpolating for A, from fig 11.23
+CL=0.93; //lift coefficient
+CD=0.07; //drag coefficient
+S=l*c //area [m^2]
+Vo=75; //velocity [m/s]
+rho=1.17; //[Kg/m^3]
+//Lift force
+FL=CL*S*rho*Vo^2/2 //[N]
+printf("\nThe downward thrust from the vane = %.f N.\n",FL)
+//Drag force
+FD=CD*S*rho*Vo^2/2
+printf("\nThe drag from the vane = %.1f N.\n",FD)
+\ No newline at end of file