Question: How can I accurately determine the height distance of a fall or a ledge?

  Options: 
 A. Using a glow stick, drop it from the top of the ledge. Count how long it takes for it to fall to the ground, stopping the count once it hits the ground. Each second passed is equal to about 10 meters, or 33 feet.
 B. Using a glow stick attached to a rope, drop the glow stick from the ledge and let it fall. Once the glow stick has fallen and reached the ground, pull up the rope and measure the length to determine the height.
Answer: B