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diff --git a/2021/CH13/EX13.3/EX13_3.pdf b/2021/CH13/EX13.3/EX13_3.pdf
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diff --git a/2021/CH13/EX13.3/EX13_3.sce b/2021/CH13/EX13.3/EX13_3.sce
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+//Finding of //Finding of Boundary layer thickness , Drag Force

+//Given

+x=1.5;

+L=2;

+b=1.4;

+vs=0.2;

+mu=0.001;

+rho=1000;

+//To Find

+A=L*b;

+R=(rho*vs*x)/mu;

+t=(4.64*x)/sqrt(R);

+t1=t*1000;

+tau=(0.323*mu*vs*sqrt(R))/x;

+R1=(rho*vs*L)/mu;

+Cd=1.292/sqrt(R);

+Fd=(1/2)*Cd*rho*(vs)^2*(2*A);

+disp("Co-efficient of Drag ="+string(Cd)+" no units")

+disp("Boundary Layer Thickness ="+string(t1)+" millimeter");

+disp("Drag Force ="+string(Fd)+" Newtons");

+