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look back now it seems so easy.. i guess the part i screwed up on was over complicating the question
if you have an initial height, set it to zero and use your height as a negative distance to travel downwards
the velocity acceleration time and distance equation will account for positive and negative motion. Once you reduce your velocity with negative acceleration to zero, you will have a negative velocity and a negative displacement. You account for that negative displacement as the height of the building and solve for your initial velcity in the y component.
thanks guys.
Now i feel like a dumbass lol
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