A satellite of mass ms and speed vs,i circles around a planet of mass mp that is moving with speed vp,i in the opposite direction.

Since gravity is a conservative force, the collision is elastic.
mp = 2.20E+24 kg
ms = 1460 kg
vs,i  x = 1.748E+4 m/s
vp,i  x = -9.20E+3 m/s
a) find the final velocity of the satellite after the collision.
b) Find the final velocity of the planet.