add check file

check.js

@@ -0,0 +1,51 @@
+// Select the input elements and the launch button
+const massInput = document.getElementById("mass");
+const velocityInput = document.getElementById("velocity");
+const angleInput = document.getElementById("angle");
+const heightInput = document.getElementById("height");
+const launchButton = document.getElementById("launch");
+
+// Function to validate inputs
+function validateInputs() {
+    const mass = parseFloat(massInput.value);
+    const velocity = parseFloat(velocityInput.value);
+    const angle = parseFloat(angleInput.value);
+    const height = parseFloat(heightInput.value);
+
+    let errors = [];
+
+    // Check each condition and add messages for any errors found
+    if (mass <= 0) {
+        errors.push("Mass must be greater than 0.");
+    }
+    if (velocity <= 0) {
+        errors.push("Initial Velocity must be greater than 0.");
+    }
+    if (angle > 90) {
+        errors.push("Angle must not be greater than 90 degrees.");
+    }
+    if (height > 100) {
+        errors.push("Initial Height must not be more than 100 meters.");
+    }
+
+    // Display errors or proceed with simulation
+    if (errors.length > 0) {
+        alert(errors.join("\n"));
+        return false;
+    }
+    return true;
+}
+
+// Event listener for the launch button
+launchButton.addEventListener("click", (e) => {
+    if (validateInputs()) {
+        // If inputs are valid, proceed with the simulation in `script.js`
+        import('./script.js').then(module => {
+            module.launchSimulation();
+        });
+    }
+});
+export function launchSimulation() {
+
+    console.log("Simulation launched with valid inputs!");
+}

index.html

@@ -54,6 +54,7 @@ <h3>Final Velocity</h3>
         </div>
       </div>
     </div>
+    <script src="./check.js"></script>
     <script type="module" src="./script.js"></script>
   </body>
 </html>