I have started them, but I am getting stumped by some of the forumals to complete them:

Need some help solving these equations. I have started them, but I am getting stumped by some of the forumals to complete them:

1.) Two manned satellites approaching one another at a relative speed of 0.200 m/s intend to dock. The first has a mass of 3.00 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. If the two satellites collide elastically rather than dock, what is their final relative velocity? Adopt the reference frame in which the second satellite is initially at rest and assume that the positive direction is directed from the second satellite towards the first satellite.

m/s

2.)(not related to question one )

Two manned satellites approaching one another at a relative speed of 0.450 m/s intend to dock. The first has a mass of 4.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. Assume that the positive direction is directed from the second satellite towards the first satellite.

(a) Calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.

I got 0.288 m/s for this answer.

(b) What is the loss of kinetic energy in this inelastic collision?

I got 299.6 for this answer

(c) Repeat both parts, in the frame of reference in which the second satellite was originally at rest.

final velocity

I keep getting this answer wrong it's supposed to be in m/s.

loss of kinetic energy is 299.6J.

Two cars collide at an icy intersection and stick together afterward. The first car has a mass of 1550 kg and was approaching at 6.00 m/s due south. The second car has a mass of 900 kg and was approaching at 19.0 m/s due west.

Magnitude I calculated at 8.7 m/s

I am stumped on the next answers:

Direction

° (counterclockwise from west is positive)

(b) How much kinetic energy is lost in the collision? (This energy goes into deformation of the cars.)

J