From f333013abf81f4cea49fb04fcd57afa03167a0c4 Mon Sep 17 00:00:00 2001
From: ASPP Student <student@localhost>
Date: Thu, 25 Sep 2025 10:42:16 +0300
Subject: [PATCH] add position as class attribute

---
 .../exercises/particle_update_position.ipynb          | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/class_materials/exercises/particle_update_position.ipynb b/class_materials/exercises/particle_update_position.ipynb
index e668f0d..5b22a19 100644
--- a/class_materials/exercises/particle_update_position.ipynb
+++ b/class_materials/exercises/particle_update_position.ipynb
@@ -52,17 +52,18 @@
    ],
    "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, position, dt):\n",
-    "        return position + self.velocity * dt\n",
+    "    def update_position(self, dt):\n",
+    "        return self.position + self.velocity * dt\n",
     "\n",
-    "particle = Particle(mass=2.1, velocity=0.8)\n",
+    "particle = Particle(mass=2.1, velocity=0.8, position = 8.2)\n",
     "print(particle.momentum())"
    ]
   },
@@ -80,7 +81,7 @@
     }
    ],
    "source": [
-    "position = 8.2\n",
+    "\n",
     "new_position = particle.update_position(position, dt=0.1)\n",
     "print(new_position)"
    ]