You can measure the height of a drop with just a rock, a phone, and the gravitational force.
https://media.wired.com/photos/5a84e80c263579570b6bfbef/master/pass/cliff-700678060.jpg
Don’t Cliff Jump Like a Dummy—Use Physics
You can measure the height of a drop with just a rock, a phone, and the gravitational force.
https://media.wired.com/photos/5a84e80c263579570b6bfbef/master/pass/cliff-700678060.jpg
