"How Deep Is It" is a physics-based app available on iPhone that combines education and entertainment seamlessly. Utilizing the accelerometer on your device, this app brings to life the classic falling body equation, d = ½gt², in a hands-on and interactive manner.

With "How Deep Is It," users can visually track the distance traveled by their device through a large text display, making it easy to understand the physics concept in a practical way. Additionally, the app provides audio feedback to further enhance the learning experience.

This free app by Tom Soderling falls under the Business & Productivity category, offering a unique way to engage with physics principles while remaining ad-free for uninterrupted exploration.