Removed implementation classes

Leaves only the framework in the compiled clause.
Find the removed files in ../examples/misc/

examples/misc/Gravity.java

@@ -0,0 +1,23 @@
+package nz.ac.massey.javaecs;
+
+public class Gravity {
+    public Gravity(){
+    }
+
+    public Gravity(double x, double y){
+        this.x = x;
+        this.y = y;
+    }
+    public Gravity(double x, double y, double terminalX, double terminalY){
+        this.x = x;
+        this.y = y;
+        this.terminalX = terminalX;
+        this.terminalY = terminalY;
+    }
+    double x = 0.0;
+    double y = -9.80665; // Force of gravity (from https://www.bipm.org/en/publications/si-brochure - 9th edition - p159 - Bureau International des Poids et Mesures - CC BY 4.0)
+    // Gravity won't be considered if the velocity exceeds this (absolute value). Negative values are ignored (not limited)
+    double terminalX = -1.0;
+    double terminalY = -1.0;
+    
+}