As a space probe approaching the planet Venus on a parabolic trajectory reaches point A closest to

Question:

As a space probe approaching the planet Venus on a parabolic trajectory reaches point A closest to the planet, its velocity is decreased to insert itinto a circular orbit. Knowing that the mass and the radius of Venus are 334 × 1021 lb??s2/ft and 3761 mi, respectively, determine

(a) The velocity of the probe as it approaches A,

(b) The decrease in velocity required to insert it into a circular orbit.