 Solution

ID: past-exam-of-the-physics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2011/paper-1/section-e/e15/i/solution

The orbit is circular for $k = 1$ . The speed equals

G M_{E} / r_{0}

and radial acceleration balances the changing direction of the velocity.

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