Here's why:
* Gravity's Dependence on Distance: The force of gravity decreases with the square of the distance between two objects. However, 200 feet is a tiny fraction of Earth's radius (approximately 3959 miles or 20,903,520 feet).
* Negligible Change: The difference in gravitational acceleration between sea level and 200 feet is so small that it's practically immeasurable in most everyday situations.
For practical purposes, you can assume the acceleration due to gravity is approximately 9.81 m/s² (32.2 ft/s²) at both sea level and 200 feet above sea level.