A baseball is thrown horizontally off a cliff with a speed of 10 ms-1. What is the vertical distance, to the nearest tenth of a meter, that the ball has fallen after 4.7 seconds?
It was vertical in the other question as well. The arrow's horizontal motion was irrelevant, all you were asked to do was find the vertical displacement during a known period of constant acceleration.
Although if it did happen to be horizontal, the same equation would still apply.