If a spacecraft approaches a planet which is moving with a velocity U, then what is the velocity of the spacecraft acquired by gravitational slingshot?

Lunar Trajectories topics include: Earth moon system, moon orbital elements, seleno-centric trajectories, lunar trajectories important parameters, minimum energy trajectory, patched conic approximations, non-coplanar lunar and interplanetary trajectories, gravity assist maneuver, seleno-centric orbit launch, heliocentric approaches, launching opportunities, planets location and fast interplanetary trajectories. A lunar trajectory is a path that involves two Keplerian orbits that are joined together at a fictitious SOI.  A cis-lunar trajectory is an orbit that revolves around the Earth,... Show more

Lunar Trajectories topics include: Earth moon system, moon orbital elements, seleno-centric trajectories, lunar trajectories important parameters, minimum energy trajectory, patched conic approximations, non-coplanar lunar and interplanetary trajectories, gravity assist maneuver, seleno-centric orbit launch, heliocentric approaches, launching opportunities, planets location and fast interplanetary trajectories.

A lunar trajectory is a path that involves two Keplerian orbits that are joined together at a fictitious SOI. 

A cis-lunar trajectory is an orbit that revolves around the Earth, Moon, or the Earth-Moon Lagrange points. It can also be a path between the Earth and Moon. 
A circumlunar trajectory, also known as a trans-lunar trajectory or lunar free return, is a type of free return trajectory. It takes a spacecraft from Earth, around the far side of the Moon, and back to Earth using only gravity. 
 

Related Test: Spaceflight Mechanics Practice Test: Interplanetary Trajectories 

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