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BillyBob shoots an arrow from the level of the top of his head, upwards at an...

BillyBob shoots an arrow from the level of the top of his head, upwards at an angle of 10 degrees from the vertical, at a velocity of 15.5m/s. He then strolls off, but the arrow hits him on the head on its way down. How far had BB got before he got shot in the head?

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