===================================================================
--- original.js
+++ change.js
@@ -26,22 +26,29 @@
 // Define the Space Ranger class
 var SpaceRanger = Container.expand(function () {
 	var self = Container.call(this);
 	var rangerGraphics = self.createAsset('spaceRanger', 'Space Ranger', 0.5, 0.5);
-	self.speed = 5;
-	self.lives = 6; // Space Ranger starts with 6 lives
-	self.moveLeft = function () {
-		self.x = Math.max(self.width / 2, self.x - self.speed);
+	self.velocity = {
+		x: 0,
+		y: 0
 	};
-	self.moveRight = function () {
-		self.x = Math.min(2048 - self.width / 2, self.x + self.speed);
+	self.acceleration = {
+		x: 0,
+		y: 0
 	};
-	self.moveUp = function () {
-		self.y = Math.max(self.height / 2, self.y - self.speed);
+	self.maxSpeed = 5;
+	self.lives = 6; // Space Ranger starts with 6 lives
+	self.applyPhysics = function () {
+		self.velocity.x += self.acceleration.x;
+		self.velocity.y += self.acceleration.y;
+		self.velocity.x = Math.max(-self.maxSpeed, Math.min(self.maxSpeed, self.velocity.x));
+		self.velocity.y = Math.max(-self.maxSpeed, Math.min(self.maxSpeed, self.velocity.y));
+		self.x += self.velocity.x;
+		self.y += self.velocity.y;
+		self.x = Math.max(self.width / 2, Math.min(2048 - self.width / 2, self.x));
+		self.y = Math.max(self.height / 2, Math.min(2732 - self.height / 2, self.y));
+		self.acceleration.x = self.acceleration.y = 0; // Reset acceleration after applying
 	};
-	self.moveDown = function () {
-		self.y = Math.min(2732 - self.height / 2, self.y + self.speed);
-	};
 });
 // Define the Meteor class
 var Meteor = Container.expand(function () {
 	var self = Container.call(this);