diff --git a/src/Acceleration.java b/src/Acceleration.java
index 3bccc68..c60c686 100644
--- a/src/Acceleration.java
+++ b/src/Acceleration.java
@@ -1,25 +1,41 @@
 import java.util.*;
 
 public class Acceleration {
-	private double mass;
-	private Map.Entry<Double, Double> force;
-	private Velocity velocity;
-	private Onground onground;
-	private Map.Entry<Double, Double> acceleration;
-	public void updateMass(double mass) {
-		this.mass = mass;
-		acceleration = (this.onground.getOnground() ? new AbstractMap.SimpleEntry<>((force.getKey()/mass), 0.0) : new AbstractMap.SimpleEntry<>((force.getKey()/mass), (force.getValue()/mass)));
-		velocity.updateAcceleration(acceleration);
-	}
-	public void updateForce(Map.Entry<Double, Double> force) {
-		this.force = force;
-		acceleration = (this.onground.getOnground() ? new AbstractMap.SimpleEntry<>((force.getKey()/mass), 0.0) : new AbstractMap.SimpleEntry<>((force.getKey()/mass), (force.getValue()/mass)));
-		velocity.updateAcceleration(acceleration);
-	}
-	public Acceleration(Velocity velocity, Onground onground) {
-		this.onground = onground;
-	}
-	public Map.Entry<Double, Double> getAcceleration() {
-		return acceleration;
-	}
+    private double massValue;
+    private Map.Entry<Double, Double> forceValue;
+    private Velocity velocity;
+    private Onground onground;
+    private Map.Entry<Double, Double> value;
+
+    public void updateByMass(double mass) {
+        this.massValue = mass;
+        Map.Entry<Double, Double> temp_l0;
+        if (this.onground.getOnground()) {
+            temp_l0 = new AbstractMap.SimpleEntry<>((forceValue.getKey() / mass), 0.0);
+        } else {
+            temp_l0 = new AbstractMap.SimpleEntry<>((forceValue.getKey() / mass), (forceValue.getValue() / mass));
+        }
+        value = temp_l0;
+        velocity.updateByAcceleration(value);
+    }
+
+    public void updateByForce(Map.Entry<Double, Double> force) {
+        this.forceValue = force;
+        Map.Entry<Double, Double> temp_l1;
+        if (this.onground.getOnground()) {
+            temp_l1 = new AbstractMap.SimpleEntry<>((force.getKey() / massValue), 0.0);
+        } else {
+            temp_l1 = new AbstractMap.SimpleEntry<>((force.getKey() / massValue), (force.getValue() / massValue));
+        }
+        value = temp_l1;
+        velocity.updateByAcceleration(value);
+    }
+
+    public Acceleration(Velocity velocity, Onground onground) {
+        this.onground = onground;
+    }
+
+    public Map.Entry<Double, Double> getValue() {
+        return value;
+    }
 }
\ No newline at end of file