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For question three, wouldn't the final velocity be negative because Shardy is free falling?
You are correct. For these problems, it's safe to assume the frame of reference where up is positive and down is negative, so that answer is technically negative. We have adjusted the answer, thanks for letting us know!
You are correct. For these problems, it's safe to assume the frame of reference where up is positive and down is negative, so that answer is technically negative. We have adjusted the answer, thanks for letting us know!