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diff --git a/Principles_Of_Foundation_Engineering/Chapter02.ipynb b/Principles_Of_Foundation_Engineering/Chapter02.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:1d0e8ca0a27c4b0cb17e7318d009efc3241a84a31e3f27c8ca705f6cb5276ce4"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 02:Natural Soil Deposits and Subsoil Exploration"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex2.1:Pg-109"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#example 2.1\n",
+      "import matplotlib.pyplot as plt\n",
+      "import numpy\n",
+      "import math\n",
+      "Distance=[2.5,5,7.5,10,15,20,25,30,35,40,50];\n",
+      "Time=(10**(-3))*numpy.array([11.2,23.3,33.5,42.4,50.9,57.2,64.4,68.6,71.1,72.1,75.5])\n",
+      "#part1\n",
+      "distance=5.25; # in meter\n",
+      "time=23e-3; # in second\n",
+      "v1=distance/time;\n",
+      "print round(v1,2),\"is speed in m/s\"\n",
+      "#part2\n",
+      "distance=11; # in meter\n",
+      "time=13.5e-3;# in second\n",
+      "v2=distance/time;\n",
+      "print round(v2,2),\" is speed in m/s\"\n",
+      "#part3\n",
+      "distance=14.75;# in meter\n",
+      "time=3.5e-3;# in second\n",
+      "v3=distance/time;\n",
+      "print round(v3,2),\"speed in m/s\"\n",
+      "plt.plot(Distance,Time);\n",
+      "plt.title(\"distance vs time\")\n",
+      "plt.xlabel(\"Distance in m\")\n",
+      "plt.ylabel(\"time in s\")\n",
+      "plt.show()\n",
+      "#part4\n",
+      "xc=10.4;\n",
+      "Ta=65e-3;\n",
+      "Z1=1/2.0*math.sqrt((v2-v1)/(v2+v1))*xc;\n",
+      "print round(Z1,2),\" is thickness of layer 1 in m\"\n",
+      "Z2=1/2.0*(Ta-2*Z1*math.sqrt(v3**2-v1**2)/v3/v1)*v3*v2/math.sqrt(v3**2-v2**2);\n",
+      "print round(Z2,2),\" is thickness of layer 2 in m\"\n",
+      "\n",
+      "# the answers are slightly different in textbook due to approximation while here answers are precise"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "228.26 is speed in m/s\n",
+        "814.81  is speed in m/s\n",
+        "4214.29 speed in m/s\n",
+        "3.9"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "  is thickness of layer 1 in m\n",
+        "12.82  is thickness of layer 2 in m\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file