Question: At time t = 0, an object is launched from ground level, with an initial speed of 80 m/s and at a launch angle ????i

At time t = 0, an object is launched from ground level,


with an initial speed of 80 m/s and at a launch angle ????i


such that cos ????i = 2/3 and sin ????i = 3/4.


The object then travels in a symmetric, parabolic path.


What is the object’s height above the ground 1 second before it reaches the top of its path?


A. 145 m


B. 150 m


C. 175 m


D. 125 m


E. 180 m


F. 130 m



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