Finish AB 2

src/Body.java

@@ -53,6 +53,10 @@ public class Body {
         return SpaceDraw.massToRadius(mass);
     }
 
+    public double mass() {
+        return mass;
+    }
+
     // Returns a new body that is formed by the collision of this body and 'b'. The impulse
     // of the returned body is the sum of the impulses of 'this' and 'b'.
     public Body merge(Body b) {