
Francisco P. answered 12/20/16
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Differential Equations is my Jam!
We are assuming that their is no other forces except for gravity when the arrow and coconut are in free fall at the same time at the same height. Since the coconut starts with zero initial vertical velocity and travels straight down due to the acceleration of gravity, the arrow should also follow these conditions since the horizontal and vertical motions are independent of each other. The problem does state that the arrow hits the coconut before it hits the ground, so the horizontal distance between them could be ignored. So which angle should you aim the arrow?