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1. At a height of h meters, you can see V kilometers to the horizon. These numbers are related by the equation V=3.5sqrt(h). A person can see 364 km to the horizon from an airplane window. How high is the airplane?
The problem gives you V (364) you just need to find h:
The airplane is 10816 meters high.
2. The formula r=2sqrt5L can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will a car skid at 50 mph?
The car will skid 125 feet.