
Concept explainers
Projectile Motion An object is propelled upward at an angle , to the horizontal with an initial velocity feet per second from the base of a plane that makes an angle of with the horizontal. See the illustration. If air resistance is ignored, the distance that it travels up the inclined plane is given by the function
Show that
In calculus, you will be asked to find the angle that maximizes by solving the equation
solve the equation for .
What is the maximum distance if feet per second?
Graph , and find the angle that maximizes the distance . Also find the maximum distance. Use feet per second. Compare the results with the answers found in parts (b) and (c).

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