A small object is initially at rest a distance r=n2R 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=n1/R. If the velocity squared of the
object just before it hits the surface is v2=n3,
what is n3? Note that all n2 is unitless, and that
both n1 and n3 have the same units of velocity squared.
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