From Sliding a Sphere

Assets/Scripts/MovingSphere.cs

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+using UnityEngine;
+
+public class MovingSphere : MonoBehaviour
+{
+    [SerializeField, Range(0f, 100f)]
+    private float maxSpeed = 10f;
+
+    [SerializeField, Range(0f, 100f)]
+    private float maxAcceleration = 10f;
+
+    [SerializeField, Range(0f, 1f)]
+    private float bounciness = 0.5f;
+
+    [SerializeField]
+    private Rect allowedArea = new Rect(-5f, -5f, 10f, 10f);
+
+    private Vector3 velocity;
+
+    private void Update()
+    {
+        Vector2 playerInput;
+        playerInput.x = Input.GetAxis("Horizontal");
+        playerInput.y = Input.GetAxis("Vertical");
+        playerInput = Vector2.ClampMagnitude(playerInput, 1f);
+        var desiredVelocity = new Vector3(playerInput.x, 0f, playerInput.y) * maxSpeed;
+        float maxSpeedChange = maxAcceleration * Time.deltaTime;
+        velocity.x = Mathf.MoveTowards(velocity.x, desiredVelocity.x, maxSpeedChange);
+        velocity.z = Mathf.MoveTowards(velocity.z, desiredVelocity.z, maxSpeedChange);
+        var displacement = velocity * Time.deltaTime;
+        var newPosition = transform.localPosition + displacement;
+        if (newPosition.x < allowedArea.xMin)
+        {
+            newPosition.x = allowedArea.xMin;
+            velocity.x = -velocity.x * bounciness;
+        }
+        else if (newPosition.x > allowedArea.xMax)
+        {
+            newPosition.x = allowedArea.xMax;
+            velocity.x = -velocity.x * bounciness;
+        }
+        if (newPosition.z < allowedArea.yMin)
+        {
+            newPosition.z = allowedArea.yMin;
+            velocity.z = -velocity.z * bounciness;
+        }
+        else if (newPosition.z > allowedArea.yMax)
+        {
+            newPosition.z = allowedArea.yMax;
+            velocity.z = -velocity.z * bounciness;
+        }
+        if (!allowedArea.Contains(new Vector2(newPosition.x, newPosition.z)))
+        {
+            newPosition.x = Mathf.Clamp(newPosition.x, allowedArea.xMin, allowedArea.xMax);
+            newPosition.z = Mathf.Clamp(newPosition.z, allowedArea.yMin, allowedArea.yMax);
+        }
+        transform.localPosition = newPosition;
+    }
+}

Assets/Scripts/MovingSphere.cs.meta

@@ -0,0 +1,11 @@
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+  externalObjects: {}
+  serializedVersion: 2
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+  icon: {instanceID: 0}
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