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someone is standing on a building, and throws a rock. the height from which the rock is thrown is 230 m. the initial velocity of the rock is 100 m/sec. thrown in the positive x direction, how far will the rock go by the time it hits the ground?

now, I used some equations to try to figure this out. I got an answer - 508.684 m. But, I'm pretty sure this must be a wrong answer. (so far, I usually get most of my homework wrong. I always miss something) it seemed too easy. and I didn't use the height from which the rock was thrown in any way. should I have needed to? I know I'm missing something here. please help me out. thanks.