Jupyter notebook version added

Author: com-py

ch03/Program_3.1_balltoss.ipynb

@@ -127,15 +127,6 @@
     "    else: vx, vy = - vx, - vy               # below floor, reverse vel.\n"
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {
-    "collapsed": true
-   },
-   "outputs": [],
-   "source": []
-  },
   {
    "cell_type": "code",
    "execution_count": null,

ch03/Program_3.8_baseball.ipynb

@@ -180,15 +180,6 @@
     "    go(x=0., y=2., vx=30., vy=0.)           # initially z=0, vz=0"
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {
-    "collapsed": true
-   },
-   "outputs": [],
-   "source": []
-  },
   {
    "cell_type": "code",
    "execution_count": null,