diff --git a/notebooks/exercises/particle_update_position.ipynb b/notebooks/exercises/particle_update_position.ipynb
index b3d829a..2b9059f 100644
--- a/notebooks/exercises/particle_update_position.ipynb
+++ b/notebooks/exercises/particle_update_position.ipynb
@@ -17,7 +17,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": 17,
    "metadata": {
     "ExecuteTime": {
      "end_time": "2018-07-27T15:05:51.531289Z",
@@ -35,7 +35,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 18,
    "metadata": {
     "pycharm": {
      "name": "#%%\n"
@@ -52,34 +52,44 @@
    ],
    "source": [
     "class Particle:\n",
-    "    def __init__(self, mass, velocity):\n",
+    "    def __init__(self, mass, velocity, position):\n",
     "        self.mass = mass\n",
     "        self.velocity = velocity\n",
+    "        self.position = position\n",
     "\n",
     "    def momentum(self):\n",
     "        return self.mass * self.velocity\n",
+    "    \n",
+    "    def update_position(self, dt):\n",
+    "        return self.position + self.velocity * dt\n",
     "\n",
-    "particle = Particle(mass=2.1, velocity=0.8)\n",
+    "    def set_position(self, new_position):\n",
+    "        self.position=new_position\n",
+    "        \n",
+    "    def get_position(self):\n",
+    "        return self.position\n",
+    "        \n",
+    "particle = Particle(mass=2.1, velocity=0.8, position=0.0)\n",
     "print(particle.momentum())"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 19,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "8.28\n"
+      "8.2\n"
      ]
     }
    ],
    "source": [
-    "position = 8.2\n",
-    "new_position = update_position(particle.velocity, position, dt=0.1)\n",
-    "print(new_position)"
+    "particle.set_position(8.2)\n",
+    "particle.update_position(dt=0.1)\n",
+    "print(particle.get_position())"
    ]
   },
   {
@@ -118,7 +128,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.11"
+   "version": "3.11.4"
   },
   "toc": {
    "nav_menu": {