Add project files.

Car simulation/Util.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Car_simulation
+{
+    public class Util
+    {
+        public static float Lerp(float a, float b, float t)
+        {
+            return a + (b - a) * t;
+        }
+    }
+
+    public static class PhysicsUtil
+    {
+        public const float G = 9.81f;
+        public const float AirDensity = 1.225f;
+
+        public static float Lerp(float a, float b, float t)
+        {
+            t = Math.Clamp(t, 0f, 1f);
+            return a + (b - a) * t;
+        }
+
+        public static float RPMToOmega(float rpm) => rpm * MathF.PI * 2f / 60f;
+        public static float OmegaToRPM(float omega) => omega * 60f / (2f * MathF.PI);
+
+        // Calculate kinetic energy: 0.5 * I * ω²
+        public static float CalculateRotationalEnergy(float inertia, float omega)
+        {
+            return 0.5f * inertia * omega * omega;
+        }
+
+        // Calculate omega from energy: ω = sqrt(2E / I)
+        public static float CalculateOmegaFromEnergy(float energy, float inertia)
+        {
+            if (energy <= 0) return 0;
+            return MathF.Sqrt(2f * energy / inertia);
+        }
+
+        public const float RAD_PER_SEC_TO_RPM = 60f / (2f * MathF.PI);  // ≈ 9.549
+        public const float RPM_TO_RAD_PER_SEC = (2f * MathF.PI) / 60f;  // ≈ 0.1047
+    }
+}