diff --git a/src/graphicsellipseitem.cpp b/src/graphicsellipseitem.cpp
index b61d8ad..6f3f645 100644
--- a/src/graphicsellipseitem.cpp
+++ b/src/graphicsellipseitem.cpp
@@ -179,8 +179,10 @@ void GraphicsEllipseItem::calculateProbePath(QPointF startPoint) {
 		double newspeedX = speedListX->at(i-1) + deltaSpeedX;
 		double newspeedY = speedListY->at(i-1) + deltaSpeedY;
 		
-		double deltaDistX = (newspeedX * timePerStep);
-		double deltaDistY = (newspeedY * timePerStep);
+		//double deltaDistX = (newspeedX * timePerStep);
+		//double deltaDistY = (newspeedY * timePerStep);
+		double deltaDistX = speedListX->at(i-1)* timePerStep + 0.5 * powerX/myMasse* timePerStep* timePerStep;
+		double deltaDistY = speedListY->at(i-1)* timePerStep + 0.5 * powerY/myMasse* timePerStep* timePerStep;
 		
 		//qDebug() << deltaDistY;