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+//Projectile aimed at target
+//refer fig. 13.9
+//let s be the distance of the target from the point of projection
+//u be the velocity of projection 
+//range
+//R=((u^2)*sind(2*alpha))/(g)
+//applying it to first case 
+//s-12=(u^2)/(2*g)
+//from second case 
+//s+24=(u^2)/(g)
+//solving we get
+s=24+24  //m
+//let the correct angle of projection be alpha, then
+//sind(2*alpha)=48/72
+alpha=41.81/2  //degree
+printf("Angle of projection=%.3f degree",alpha)
+
+
+