diff --git a/src/Acceleration.java b/src/Acceleration.java
index 8a8aef6..5a9ae7e 100644
--- a/src/Acceleration.java
+++ b/src/Acceleration.java
@@ -1,37 +1,41 @@
 import java.util.*;
 
 public class Acceleration {
-	private Map.Entry<Double, Double> force;
-	private double mass;
-	private Velocity velocity;
-	private Onground onground;
-	private Map.Entry<Double, Double> acceleration;
-	public void updateForce(Map.Entry<Double, Double> force) {
-		this.force = force;
-		Map.Entry<Double, Double> temp_l3;
-		if(this.onground.getOnground()) {
-			temp_l3 = new AbstractMap.SimpleEntry<>((force.getKey()/mass), 0.0);
-		} else {
-			temp_l3 = new AbstractMap.SimpleEntry<>((force.getKey()/mass), (force.getValue()/mass));
-		}
-		acceleration = temp_l3;
-		velocity.updateAcceleration(acceleration);
-	}
-	public void updateMass(double mass) {
-		this.mass = mass;
-		Map.Entry<Double, Double> temp_l6;
-		if(this.onground.getOnground()) {
-			temp_l6 = new AbstractMap.SimpleEntry<>((force.getKey()/mass), 0.0);
-		} else {
-			temp_l6 = new AbstractMap.SimpleEntry<>((force.getKey()/mass), (force.getValue()/mass));
-		}
-		acceleration = temp_l6;
-		velocity.updateAcceleration(acceleration);
-	}
-	public Acceleration(Velocity velocity, Onground onground) {
-		this.onground = onground;
-	}
-	public Map.Entry<Double, Double> getAcceleration() {
-		return acceleration;
-	}
+    private Pair<Double> force;
+    private double mass;
+    private Velocity velocity;
+    private Onground onground;
+    private Pair<Double> value;
+
+    public void updateForce(Pair<Double> force) {
+        this.force = force;
+        Pari<Double> temp_l3;
+        if (this.onground.getOnground()) {
+            temp_l3 = new Pair<>((force.getFirst() / mass), 0.0);
+        } else {
+            temp_l3 = new Pair<>((force.getFirst() / mass), (force.getSecond() / mass));
+        }
+        value = temp_l3;
+        velocity.updateAcceleration(value);
+    }
+
+    public void updateMass(double mass) {
+        this.mass = mass;
+        Pair<Double> temp_l6;
+        if (this.onground.getOnground()) {
+            temp_l6 = new Pair<>((force.getFirst() / mass), 0.0);
+        } else {
+            temp_l6 = new Pair<>((force.getFirst() / mass), (force.getSecond() / mass));
+        }
+        value = temp_l6;
+        velocity.updateAcceleration(value);
+    }
+
+    public Acceleration(Velocity velocity, Onground onground) {
+        this.onground = onground;
+    }
+
+    public Pair<Double> getValue() {
+        return value;
+    }
 }
\ No newline at end of file