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    "# Exercise: Add the function `update_position` to the `Particle` class\n",
    "\n",
    "- Make the function `update_position` into a method of the class `Particle`\n",
    "- Where do the position `position` of the particle belong? Modify the class constructor if necessary\n",
    "- Once it is done, create a particle with mass 2.1 with velocity 0.8 at position 8.2 . Update the position with dt=0.1 and print out the new location."
   ]
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    "def update_position(velocity, position, dt):\n",
    "    return position + velocity * dt"
   ]
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     "text": [
      "1.6800000000000002\n"
     ]
    }
   ],
   "source": [
    "class Particle:\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",
    "        self.position = self.position + self.velocity * dt\n",
    "        return self.position\n",
    "\n",
    "particle = Particle(mass=2.1, velocity=0.8)\n",
    "print(particle.momentum())"
   ]
  },
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   "execution_count": null,
   "metadata": {},
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    {
     "name": "stdout",
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     "text": [
      "8.28\n"
     ]
    }
   ],
   "source": [
    "position = 8.2\n",
    "particle = Particle(2.1, 0.8, position)\n",
    "new_position = particle.update_position(dt=0.1)\n",
    "print(new_position)"
   ]
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