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A plane flying with a constant speed of km/h passes over a ground radar station at an altitude of km and climbs at an angle of degree. At what rate is the distance from the plane to the radar station increasing a minute later?
A runner sprints around a circular track of radius at a constant speed of . The runner’s friend is standing at a distance from the center of the track. How fast is the distance between the two friends changing when the distance between them is ?
Explain the difference between an absolute minimum and a local minimum.
km/h passes over a ground radar station at an altitude of 
km and climbs at an angle of 
degree. At what rate is the distance from the plane to the radar station increasing a minute later?
at a constant speed of 
. The runner’s friend is standing at a distance 
from the center of the track. How fast is the distance between the two friends changing when the distance between them is 
