adding in some needed packages

Assets/Bremsengine/2D Ragdoll Arms/RagdollArm2D.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using Core.Extensions;
+
+namespace Bremsengine
+{
+    public class RagdollArm2D : MonoBehaviour
+    {
+        float rotation = 0f; // this is nan
+        float velocityY = 0f;
+        [SerializeField] float lerpSpeed = 10f;
+        [SerializeField] float idleRotation = -45f;
+        [SerializeField] float fallRotation = 45f;
+        float lerp = 0f; //this is also nan
+        Vector2 lastPosition = Vector2.zero;
+        [SerializeField] bool flip;
+        private void Update()
+        {
+            velocityY = (transform.position.y - lastPosition.y) * (1f / Time.deltaTime);
+            float fallDot = (15f - (15f - velocityY)) / 15f;
+
+            lerp = (float.IsNaN(lerp) ? 0f : lerp) + (-fallDot * Time.deltaTime * lerpSpeed);
+            if (lerp > 0f && velocityY > -2f)
+            {
+                lerp -= Time.deltaTime * lerpSpeed;
+            }
+            lerp = lerp.Clamp(0f, 1f);
+            lastPosition = transform.position;
+
+            rotation = idleRotation.Lerp(fallRotation, lerp);
+            Vector2 look = (Vector2)transform.position + (!flip ? Vector2.right.Rotate2D(rotation) : Vector2.left.Rotate2D(rotation));
+            transform.Lookat2D(look);
+        }
+    }
+}

Assets/Bremsengine/2D Ragdoll Arms/RagdollArm2D.cs.meta

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