diff --git a/src/Acceleration.java b/src/Acceleration.java
index c60c686..aa03887 100644
--- a/src/Acceleration.java
+++ b/src/Acceleration.java
@@ -2,40 +2,41 @@
 
 public class Acceleration {
     private double massValue;
-    private Map.Entry<Double, Double> forceValue;
+    private Vector2 forceValue;
     private Velocity velocity;
     private Onground onground;
-    private Map.Entry<Double, Double> value;
+    private Vector2 value;
 
     public void updateByMass(double mass) {
         this.massValue = mass;
-        Map.Entry<Double, Double> temp_l0;
+        Vector2 temp_l0;
         if (this.onground.getOnground()) {
-            temp_l0 = new AbstractMap.SimpleEntry<>((forceValue.getKey() / mass), 0.0);
+            temp_l0 = new Vector2((forceValue.getX() / mass), 0.0);
         } else {
-            temp_l0 = new AbstractMap.SimpleEntry<>((forceValue.getKey() / mass), (forceValue.getValue() / mass));
+            temp_l0 = new Vector2((forceValue.getX() / mass), (forceValue.getY() / mass));
         }
         value = temp_l0;
         velocity.updateByAcceleration(value);
     }
 
-    public void updateByForce(Map.Entry<Double, Double> force) {
+    public void updateByForce(Vector2 force) {
         this.forceValue = force;
-        Map.Entry<Double, Double> temp_l1;
+        Vector2 temp_l1;
         if (this.onground.getOnground()) {
-            temp_l1 = new AbstractMap.SimpleEntry<>((force.getKey() / massValue), 0.0);
+            temp_l1 = new Vector2((force.getX() / massValue), 0.0);
         } else {
-            temp_l1 = new AbstractMap.SimpleEntry<>((force.getKey() / massValue), (force.getValue() / massValue));
+            temp_l1 = new Vector2((force.getX() / massValue), (force.getY() / massValue));
         }
         value = temp_l1;
         velocity.updateByAcceleration(value);
     }
 
     public Acceleration(Velocity velocity, Onground onground) {
+        this.velocity = velocity;
         this.onground = onground;
     }
 
-    public Map.Entry<Double, Double> getValue() {
+    public Vector2 getValue() {
         return value;
     }
 }
\ No newline at end of file