# Chapter 10 - Reading Check Questions (Comprehension): 10

The speed v and the curvature are closely related. After an elapsed time t, it will have moved a horizontal distance vt and fallen a vertical distance $\frac{1}{2}gt^{2}$ below the horizontal. If the Earth's surface curves downward by exactly that distance, the projectile will be at the same height above the surface.

#### Work Step by Step

This is discussed on page 190.

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