Question: A distant large astroid is detected that might pose a threat to earth. If it were to continue in a straight line at constant speed,

A distant large astroid is detected that might pose a threat to earth. If it were to continue in a straight line at constant speed, it would pass 22000 km from the center of the earth. However, it will be attracted to earth and might hit our planet. What speed should the astroid have to just graze the surface of the earth?

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