diff --git a/src/main/java/resources/Acceleration.java b/src/main/java/resources/Acceleration.java
index f7d33d4..69f1a18 100644
--- a/src/main/java/resources/Acceleration.java
+++ b/src/main/java/resources/Acceleration.java
@@ -2,30 +2,30 @@
 
 public class Acceleration {
     private double massValue;
-    private Vector2 forceValue;
+    private Pair<Double> forceValue;
     private Velocity velocity;
     private Onground onground;
-    private Vector2 value;
+    private Pair<Double> value;
 
     public void updateByMass(double mass) {
         this.massValue = mass;
-        Vector2 temp_l0;
+        Pair temp_l0;
         if (this.onground.getOnground()) {
-            temp_l0 = new Vector2((forceValue.getX() / mass), 0.0);
+            temp_l0 = new Pair((forceValue.getFirst() / mass), 0.0);
         } else {
-            temp_l0 = new Vector2((forceValue.getX() / mass), (forceValue.getY() / mass));
+            temp_l0 = new Pair((forceValue.getFirst() / mass), (forceValue.getSecond() / mass));
         }
         value = temp_l0;
         velocity.updateByAcceleration(value);
     }
 
-    public void updateByForce(Vector2 force) {
+    public void updateByForce(Pair<Double> force) {
         this.forceValue = force;
-        Vector2 temp_l1;
+        Pair temp_l1;
         if (this.onground.getOnground()) {
-            temp_l1 = new Vector2((force.getX() / massValue), 0.0);
+            temp_l1 = new Pair((force.getFirst() / massValue), 0.0);
         } else {
-            temp_l1 = new Vector2((force.getX() / massValue), (force.getY() / massValue));
+            temp_l1 = new Pair((force.getFirst() / massValue), (force.getSecond() / massValue));
         }
         value = temp_l1;
         velocity.updateByAcceleration(value);
@@ -36,7 +36,7 @@
         this.onground = onground;
     }
 
-    public Vector2 getValue() {
+    public Pair getValue() {
         return value;
     }
 }
\ No newline at end of file