2 files changed, 30 insertions, 0 deletions
diff --git a/3886/CH12/EX12.4/12_4.sce b/3886/CH12/EX12.4/12_4.sce
new file mode 100644
index 000000000..cc04c1e0f
--- /dev/null
+++ b/3886/CH12/EX12.4/12_4.sce
@@ -0,0 +1,24 @@
+//Crossing of balls
+//refer fig. 12.8
+//1.for motion of first ball
+au=0
+//1s=30-h
+aa=9.81  //m/sec^2
+//2.for motion of second ball
+bu=15  //m/sec
+//s=h
+ba=-9.81  //m/sec^2
+//30-h=0*t+(9.81*t^2)/2  ...(1)
+//h=15*t-(9.81*t^2)/2  ...(2)
+//solving (1) and (2)
+t=30/15
+h=15*2-(9.81*2^2)/2  //m
+//at t=2
+//downward velocity of first ball
+v1=0+9.81*2  //m/sec
+//Upward velocity of second ball
+v2=15-9.81*2  //m/sec
+//relative velocity vr
+vr=v1-(-v2)  //m/sec
+printf("\nt=%.2f sec\nh=%.2f m\nvr=%.2f m/sec",t,h,vr)
+
diff --git a/3886/CH12/EX12.4/12_4.txt b/3886/CH12/EX12.4/12_4.txt
new file mode 100644
index 000000000..1d8a08fce
--- /dev/null
+++ b/3886/CH12/EX12.4/12_4.txt
@@ -0,0 +1,6 @@
+ 
+--> exec('E:\My program EM\12. Linear motion\12.4.sce', -1)
+
+t=2.00 sec
+h=10.38 m
+vr=15.00 m/sec
+\ No newline at end of file