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You want to launch a projectile horizontally from a point 19.7 m above the flat level ground below so that it strikes the ground at

You want to launch a projectile horizontally from a point 19.7 m above the flat level ground below so that it strikes the ground at a point 38.0 m away from a point directly below the point from which it is fired. How fast (in km/h) should the projectile be moving when it is launched?

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