Two buses with mass 2100kg and 1500kg moves with the velocities 15 m/s and 10 m/s respectively ,towards each other. The initial distance between the two buses was 300m. After some timereason they collide and collision time is 0.1s. After collision they move with combined velocity 4.583 m/s.
Q. What will be thein action action and reaction force for the above collision?will it be equal?

[Side questions-]
-During collision between two bodies with uniform velocities, do we calculate the action and reaction force separately for each body or can it calculated combinedly?
-As they are in uniform velocity, shouldn't their force bw zero?