Physics

Problem

A meteoroid starts from rest at a distance

10R_{\oplus}

from Earth’s centre and falls directly toward Earth. Neglecting atmospheric drag, determine its speed when it reaches

2R_{\oplus}

. (Take

g = 9.8\,\text{m s}^{-2}

and

R_{\oplus}=6.4\times10^{6}\,\text{m}

.) a)

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

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

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

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