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diff --git a/1325/CH2/EX2.9/ex2_9.sce b/1325/CH2/EX2.9/ex2_9.sce
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+//to find force that must be exerted in oeder to give an acceleration of 3ft/s^2 and smallest value of u(friction coefficient)
+//gravitaional force (g)=32.2 ft/s^2
+clc
+printf("\n")
+//given
+m=10//ton
+m2=1000//lb
+a=3//ft/s^2
+//the addition to actual mass in order to allow for the rotational inertia of the wheels and axles
+m1=2*(1000/2240)*(15/21)^2//m1=m2*k^2/r^2 and 1 ton=2240 lbs
+M=m+m1
+F=3*(10.46/32.2)//F=M.a
+f=F*2240//lb
+Fa=(2*1000/2240)*(3/32.2)*(15/21)^2//total tangential force required in order to provide the angular acceleration of the wheels and axles
+//Limiting friction force =uW 
+//u*10>0.042
+u=0.042/10
+printf("The total tangential force required in order to provide the angular acceleration of the wheels and axles is %.4f ton\n",Fa)
+printf("If there is to be pure rolling ,u>%.4f",u)
+