Physics

Problem

A spacecraft orbits just above Earth’s surface with speed

7.9\,\text{km s}^{-1}

. What minimum speed must it be given, at the same altitude, to escape Earth’s gravitational field? a)

15.8\,\text{km s}^{-1}

7.9\,\text{km s}^{-1}

11.2\,\text{km s}^{-1}

9.98\,\text{km s}^{-1}