Each ball has a mass of 0.05 kg.

Each ball’s initial velocity is 6 m/s.

Before the impact, each ball’s initial momentum

0.3 kg m/s = 0.05 x 6

The direction of motion of the balls changes after the impact, but the amount of the velocity remains constant.

Final momentum after the first ball collides = –0.05 x 6 = –0.3 kg m/s

After the second ball collides, the final momentum is 0.3 kg m/s.

The initial ball received an impulse of (-0.3) – (0.3) = – 0.6 kg m/s.

The second ball received an impulse of (0.3) – (-0.3) = 0.6 kg m/s.

In terms of direction, the two impulses are in opposition.