During a flyby of the earth, the velocity of a spacecraft is 6.5 mi/s as it reaches its minimum altitude of 620 mi above the surface at point O. At point B the spacecraft is observed to have an altitude of 5200 mi. Assuming that the trajectory of the spacecraft is parabolic, determine its speed at(a) Point A,(b) PointB.

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620 mi 3960 mi 45 491 5200 mi