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3. As a space probe approaching the planet Venus on a parabolic trajec-
tory reaches point A closest to the planet, its velocity is decreased to
insert it into a circular orbit. Knowing that the mass and the radius
of Venus are 4.87 × 10²4 kg and 6052 km, respectively, determine
(a) the velocity of the probe as it approaches A, (b) the decrease in
velocity required to insert it into the circular orbit.
B
A
280 km

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