Problem an erupting volcano violently projects a boulder, Ask an Expert

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Problem: An erupting volcano violently projects a boulder from a vent at an angle of 40 degrees relative to the horizontal. The ejection point is 2.5km above the horizontal, and the landing point is 6.0km along the horizontal.

Part A: What was the magnitude of its initial velocity?

I need help to find what the magnitude of its initial velocity.

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