diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
new file mode 100644
index 0000000..9ae4a1c
--- /dev/null
+++ b/.github/pull_request_template.md
@@ -0,0 +1,20 @@
+## Description
+
+Briefly describe what this PR implements.
+
+## Changes Made
+
+- 
+- 
+- 
+
+## Implementation Details
+
+Mention key design decisions if any.
+
+
+## Checklist
+**Type:** 
+- [ ] Bug Fix  
+- [ ] Feature 
+- [ ] Chore
diff --git a/CMakeLists.txt b/CMakeLists.txt
index fca2e14..364982b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,23 +1,12 @@
 cmake_minimum_required(VERSION 3.20)
 
-project(AetherPhysics)
+project(Aether_Test)
 
 set(CMAKE_CXX_STANDARD 20)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
-set(CMAKE_CXX_EXTENSIONS OFF)
 
-# Collect source files
-file(GLOB_RECURSE ENGINE_SOURCES engine/*.cpp)
-file(GLOB_RECURSE APP_SOURCES app/*.cpp)
-
-# Create executable
-add_executable(AetherPhysics
-    ${ENGINE_SOURCES}
-    ${APP_SOURCES}
+add_executable(Aether_Test
+    app/main.cpp
+    engine/vec3.cpp
 )
 
-# Include directories
-target_include_directories(AetherPhysics
-    PRIVATE
-        engine
-)
\ No newline at end of file
+target_include_directories(Aether_Test PRIVATE engine)
\ No newline at end of file
diff --git a/app/main.cpp b/app/main.cpp
index a71bc9f..8e48acb 100644
--- a/app/main.cpp
+++ b/app/main.cpp
@@ -1,6 +1,39 @@
 #include <iostream>
+#include<chrono>
+#include<thread>
+#include "vec3.hpp"
+
 using namespace std;
 int main(){
     cout << "Hello Worlds\n";
+
+    const float dt=1.0f/60.0f;
+    const Vec3 gravity(0.0f,-9.8f,0.0f);
+
+    Vec3 position(0.0f,10.0f,0.0f);
+    Vec3 velocity;
+
+    float simulation_time=0.0f;
+    float total_runtime=3.0f; // we will run the simulation for 3 seconds in the startung testing phase
+
+    auto last_time=std::chrono::high_resolution_clock::now();
+    float accumulator=0.0f;
+
+    while(simulation_time<total_runtime){
+        auto current_time=std::chrono::high_resolution_clock::now();
+        float frametime=std::chrono::duration<float>(current_time-last_time).count();
+        last_time=current_time;
+
+        accumulator+=frametime;
+        while(accumulator>=dt){
+            velocity=velocity+(gravity*dt);
+            position=position+(velocity*dt);
+
+            simulation_time+=dt;
+            accumulator-=dt;
+        }
+        std::cout<<"Time: "<<simulation_time<<"  Y Position: "<< position.y<<std::endl;
+        std::this_thread::sleep_for(std::chrono::milliseconds(16));
+    }
     return 0;
 }
\ No newline at end of file
diff --git a/engine/vec3.cpp b/engine/vec3.cpp
new file mode 100644
index 0000000..36e54cb
--- /dev/null
+++ b/engine/vec3.cpp
@@ -0,0 +1,31 @@
+#include "vec3.hpp"
+
+Vec3::Vec3():x(0.0f),y(0.0f),z(0.0f){}
+
+Vec3::Vec3(float x, float y, float z):x(x),y(y),z(z){}
+
+Vec3 Vec3::operator+(const Vec3& other) const {
+    return Vec3(x+other.x, y+other.y, z+other.z);
+}
+
+Vec3 Vec3::operator-(const Vec3& other) const {
+    return Vec3(x-other.x, y-other.y,z-other.z);
+}
+
+Vec3 Vec3::operator*(float scalar) const {
+    return Vec3(x * scalar, y * scalar, z * scalar);
+}
+
+float Vec3::dot(const Vec3& other) const {
+    return x * other.x + y * other.y + z * other.z;
+}
+
+float Vec3::length() const {
+    return std::sqrt(dot(*this));
+}
+
+Vec3 Vec3::normalized() const {
+    float len = length();
+    if (len == 0.0f) return Vec3();
+    return (*this) * (1.0f / len);
+}
\ No newline at end of file
diff --git a/engine/vec3.hpp b/engine/vec3.hpp
new file mode 100644
index 0000000..52c3e8b
--- /dev/null
+++ b/engine/vec3.hpp
@@ -0,0 +1,17 @@
+#include <cmath>
+
+class Vec3 {
+public:
+    float x, y, z;
+
+    Vec3();
+    Vec3(float x, float y, float z);
+
+    Vec3 operator+(const Vec3& other) const;
+    Vec3 operator-(const Vec3& other) const;
+    Vec3 operator*(float scalar) const;
+
+    float dot(const Vec3& other) const;
+    float length() const;
+    Vec3 normalized() const;
+};
\ No newline at end of file