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5) Beings on spherical asteroid /7 have observed that a large rock is approaching their asteroid in a collision course. At 7514 km from the center of the asteroid, the rock has a speed of 136.0 m/s and later at 2823 km it has a speed of 392.0 m/s. Use energy conservation to find the mass of asteroid /7. You can neglect any effects due to the parent star of the asteroid. (G=6.67x10" N m' /kg' )