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

As a space approaching the planet Venus on a parabolic trajectory reaches point A closest to the planet, its velocity is decreased to insert it into a circular orbit. Knowing that the mass and 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.