Here's why:
* Gravity is constant: Earth's gravitational pull is relatively constant near the surface. It only changes significantly when you're very far from the Earth's center.
* Distance: 40 feet is a very small distance compared to the Earth's radius (approximately 3,959 miles). This tiny change in height makes a negligible difference in gravitational force.
Technically, there is a slight decrease in gravity at 40 feet, but it's so small that it's practically impossible to notice or measure without specialized instruments.
To give you an idea:
* The gravitational force at sea level is approximately 9.8 m/s².
* At 40 feet, the gravitational force would be slightly less than 9.8 m/s², but the difference would be in the order of millionths of a meter per second squared.
So, for all practical purposes, you can consider the pull of gravity to be the same at 40 feet as it is at ground level.
