diff --git a/OGP1718-Worms/src/worms/model/Projectile.java b/OGP1718-Worms/src/worms/model/Projectile.java
index 7f35a7b..d215699 100644
--- a/OGP1718-Worms/src/worms/model/Projectile.java
+++ b/OGP1718-Worms/src/worms/model/Projectile.java
@@ -1,5 +1,7 @@
 package worms.model;
 
+import static java.lang.Math.*;
+
 import worms.util.Coordinate;
 
 public abstract class Projectile extends GameObject {
@@ -17,7 +19,7 @@ public abstract class Projectile extends GameObject {
 
 
 	public static double calcRadius(double mass) {
-		return Math.pow(((mass / 1000.0 / rho) * (3.0 / (4.0 * Math.PI))), 1.0 / 3.0);
+		return pow(((mass / 1000.0 / rho) * (3.0 / (4.0 * PI))), 1.0 / 3.0);
 	}
 
 	public double getForce() {
@@ -63,30 +65,88 @@ public abstract class Projectile extends GameObject {
 						!getWorld().isAdjacent(location, radius));
 	}
 
-
+	public static final double G = 5.0;
+	
+	public static final double FORCE_TIME = 0.5;
+	
 	public Coordinate getJumpStep(double elapsedTime) {
 		// TODO zie naar worm hoe dit moet, implementatie moet wel anders!
-		if (Double.isNaN(elapsedTime) || elapsedTime > this.getJumpTime(jumpTimeStep) || elapsedTime < 0)
+		// DONE?
+		if (Double.isNaN(elapsedTime) || elapsedTime > this.getJumpTime(elapsedTime) || elapsedTime < 0)
 			throw new IllegalArgumentException();
 		
 		double velocity = this.jumpVelocity();
 		
-		
-		
-		return null;
+		return Coordinate.create(getLocation().getX() + velocity * cos(getOrientation()) * elapsedTime,
+				getLocation().getY() + velocity * sin(getOrientation()) * elapsedTime - 0.5 * G * pow(elapsedTime, 2) );
 	}
 
-	public double jumpVelocity() {
-		return -1;
+	private double jumpVelocity() {
+		//wat met de action points?
+		double force = 5 * Worm.getActionPoints() + getMass() * G;
+		return force/getMass() * FORCE_TIME;
 	}
 	
-	public double getJumpTime(double jumpTimeStep) {
-
+	private double getJumpTime(double jumpTimeStep) {
 		// TODO zie naar worm hoe dit moet, implementatie moet wel anders!
-		return 0.0;
+		//wat met parameter jumpTimeStep?
+		
+		double v = jumpVelocity();
+		double time = 0;
+		double a = getOrientation();
+		Coordinate loc = getLocation();
+		World world = getWorld();
+		double radius = getRadius();
+		Coordinate newLoc;
+		
+		while (true) {
+			time += 0.05;
+			double x = loc.getX() + v * time * cos(a);
+			double y = loc.getY() + v * time * sin(a) - (G * time * time) / 2.0;
+			newLoc = Coordinate.create(x, y);
+			if (! world.isPassable(newLoc, radius) || x < 0 || y < 0 || x > world.getWidth() || y > world.getHeight()) {
+				while (true) {
+					time -= 0.01;
+					newLoc = Coordinate.create(loc.getX() + v * time * cos(a), loc.getY() + v * time * sin(a) - (G * time * time) / 2.0);
+					if (newLoc.getX() < 0 || newLoc.getY() < 0 || newLoc.getX() > getWorld().getWidth() ||
+                            newLoc.getY() > world.getHeight() || world.isAdjacent(newLoc, radius)) {
+						break;
+					}
+				}
+				break;
+			}
+			if ((int) round(time) == 10) {
+				throw new RuntimeException();
+			}
+		}
+		
+		return time;
+	}
+	
+	private boolean canJump() {
+		// wat met action points.
+		return Worm.getActionPoints() > 0 && getOrientation() < PI;
 	}
 
-	public void jump() {
+	public void jump() throws IllegalStateException {
 		// TODO zie naar worm hoe dit moet, implementatie moet wel anders!
+		// wat meegeven met getJumpTime() ?
+		// wat met action points?
+		
+		if (!canJump())
+			throw new IllegalStateException();
+		
+		double v = jumpVelocity();
+		double t = getJumpTime();
+		double a = getOrientation();
+		
+		Coordinate newLocation = Coordinate.create(getLocation().getX() + v * t * cos(a), getLocation().getY() + v * t * sin(a) - (G * t * t) / 2.0);
+		
+		if (! isValidLocation(newLocation)) {
+			terminate();
+			return;
+		}
+		setLocation(newLocation);
+		Worm.setActionPoints(0);
 	}
 }
\ No newline at end of file