2 files changed, 34 insertions, 0 deletions
diff --git a/3886/CH13/EX13.12/13_12.sce b/3886/CH13/EX13.12/13_12.sce
new file mode 100644
index 000000000..8e7171a05
--- /dev/null
+++ b/3886/CH13/EX13.12/13_12.sce
@@ -0,0 +1,26 @@
+//soldier fires a bullet
+//refer fig 13.18
+//equation of trajectory of bullet is known thus
+//For the point on ground where bullet strikes
+y=-50  //m
+x=100 //m
+u=31.32  //m/sec
+//alpha=0 or
+alpha=atand(2)  //degree
+//when alpha =0
+//Horizontal component of velocity
+vx=31.32  //m/sec
+//Vertical component of velocity
+vy=sqrt(2*9.81*50)  //m/sec
+//Velocity of strike
+v=sqrt((31.32^2)+(31.32^2))  //m/sec
+theta=atand(1)  //degree
+//when alpha=63.435 degree   vx=14.007 m/sec
+//vy=42.02 m/sec
+bv=sqrt((14.007^2)+(42.02^2))  //m/sec
+btheta= atand(42.02/14.007)  //degree to horizontal
+printf("\nalpha=%.2f degree\nv=%.2f m/sec\ntheta=%.2f degree\nv=%.2f m/sec\ntheta=%.2f degree to horizontal",alpha,v,theta,bv,btheta)
+
+
+
+ 
diff --git a/3886/CH13/EX13.12/13_12.txt b/3886/CH13/EX13.12/13_12.txt
new file mode 100644
index 000000000..85d20f29d
--- /dev/null
+++ b/3886/CH13/EX13.12/13_12.txt
@@ -0,0 +1,8 @@
+ 
+--> exec('E:\My program EM\13. Projectiles\13.12.sce', -1)
+
+alpha=63.43 degree
+v=44.29 m/sec
+theta=45.00 degree
+v=44.29 m/sec
+theta=71.56 degree to horizontal
+\ No newline at end of file