Problem B5:
A small object is initially at rest a distance r=n_{2}R from the
center of a spherical planet. The radius of the planet is R. The object is
released and crashes on the surface of the planet. The gravitational acceleration
on the surface of the planet is g=n_{1}/R. If the velocity squared of the
object just before it hits the surface is v^{2}=n_{3},
what is n_{3}? Note that all n_{2} is unitless, and that
both n_{1} and n_{3} have the same units of velocity squared.

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