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A rock is dropped from high above the surface of the Earth.
The initial speed is 0, and the initial height above the
surface is NXRE where RẺ is the radius of the Earth. Calculate
the speed of the rock when it hits the upper atmosphere, say
at height 20 km above the surface.
DATA for the Earth:
radius RE 6.38×106 m; mass ME
N = 15;
(in m/s)
=
=
5.98x1024 kg.

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