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(b) To barely escape means to have total energy equal to zero (see discussion prior to Eq.
1328). If
m
is the mass of the meteoroid, then
2
4
14
08
.
9
1
0
m
/
s
.
2
GmM
GmM
GM
mv
v
rr
r
−−=
¡
==
×
83. (a) We write the centripetal acceleration (which is the same for each, since they have
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 Spring '08
 Any
 Physics, Acceleration, Mass

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