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Solve the all given parts of following question:

Question: You shoot an arrow into the air. Two seconds later (2.00 s) the arrow has gone straight upward to a height of 26.0m above its launch point.

Part I: What was the arrow's initial speed?

Part II: How long did it take for the arrow to first reach a height of 13.0m above its launch point?

Explain how you came up the prefixes and answer please.

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