Mary spots Bill approaching the dorm at a constant rate of 2 m/s on the walkway that passes directly beneath her window, 17 above the ground. When Bill is 120 m away from the point below her window she decided to drop an apple down to him. What is the angle between Mary and Bill at the instant Mary releases the apple?
(There were other parts to this problem, but I got the correct answers to those).
2. The attempt at a solution
Since Bill is 120 m away and the building is 17 m high, tan θ = opp/adj = 120/17, θ = 81.93 degrees
But this is not the right answer :( Any help would be appreciated, thanks!