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ok see
f = ma
gm M/H2
is force. this = mass * acc.
there, the mass is reduced mass.
(reduced mass is ALWAYS used in 2 particle system. ALWAYS during intenal forces like grav and electro. its just that when one particle is MUCH bigger, then the big one mostly stays at rest.. this is case with earth and an astronaut)
the formula i already gave. use it.
then find the acc.
from there you can find your answer. just use kinematic eqn
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Moderation Team
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