I had no idea how to explain this so: This is a very simple project that tells you the height of a cliff or the depth of a well. All you do is time how long it takes for the object to hit the ground and let science do the rest. You can even measure the height of a cliff from the ground if you throw a rock right up to the top and start timing at the apex (https://itunes.apple.com/us/app/cliff-height-timer/id893030245?mt=8) Example have a friend jump off a cliff. When he jumps start the timer, then when he hits the water stop the timer.
My Brain