A distant large asteroid is detected that might pose a threat to Earth. If it were to continue moving in a straight line at constant speed, it would pass 28500 km from the center of Earth. However, it will be attracted to Earth and might hit our planet. What is the minimum speed, in meters per second, that the asteroid should have when it is detected for it to miss hitting Earth? In other words, what speed should the asteroid have for it to just graze the surface of Earth?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!