1. The problem statement, all variables and given/known data As a command module, orbiting the moon passed through a point A (120km altitude), it released a lunar excursion module, which crashed into the moons surface at point B. Knowing the angle AOB was 50 deg (where O is the centre of the moon), determine the velocity of the lunar excursion module, when it was cast adrift, relative to the command module. 2. Relevant equations Also know the point A is the apogee of the elliptic crash trajectory, and the mass of the moon is 0.0123 times the mass of the earth. Therefore mass of moon = 7.36 × 10^22 kg. 3. The attempt at a solution This is my first real attempt at a orbital question so I am kind of winging it. Any help would be greatly appreciated.