A spherical planet may be assumed to be an isolated point mass with...

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A spherical planet may be assumed to be an isolated point mass with its mass concentrated at its centre. A small mass \( m \) is moving near to, and normal to, the surface of the planet. The mass moves away from the planet through a short distance \( h \).State and explain why the change in gravitational potential energy \( \Delta \mathrm{Uof} \) the mass is given by the expression
\[
\Delta \mathrm{U}=m g h
\]
where \( g \) is the acceleration of free fall.
\( \mathrm{P} \)
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