A spacecraft is in a circular orbit of radius 3R around the moon. At point A, the

Question:

A spacecraft is in a circular orbit of radius 3R around the moon. At point A, the spacecraft ejects a probe which is designed to arrive at the surface of the moon at point B. Determine the necessary velocity v_r of the probe relative to the spacecraft just after ejection. Also calculate the position θ of the spacecraft when the probe arrives at point B.