diff --git a/src/Acceleration.java b/src/Acceleration.java
new file mode 100644
index 0000000..c60c686
--- /dev/null
+++ b/src/Acceleration.java
@@ -0,0 +1,41 @@
+import java.util.*;
+
+public class 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;
+    }
+}
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