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In an airless world, a slingshot fires identical BBs from a rooftop at different angles down to the level ground below it's fired nearly straight

In an airless world, a slingshot fires identical BBs from a rooftop at different angles down to the level ground below it's fired nearly straight upward, straight outward horizontally, and straight downward. In which case does the BB strike the ground moving fastest? Explain.

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