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**A projectile is fired over level ground with an initial velocity that has a vertical component of 20 m/s and a horizontal component of 30 m/s. Using g = 10 m/s², find the distance from launching to landing points.**

**I don't know what formula to use to solve this question. I would appriciate your help.**

**I start off by finding the magnitude of the resultant vector: √30² + 20², then I don't know what to do next...**

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