A blue and a green billiard ball, each have a mass of 0.15 kg. Before they collide, the blue ball had a speed of 3 m/s while the green ball had a speed of -2 m/s. What direction are they traveling? (1 point)
At a 90-degree angle to each other.
In opposite directions, towards each other.
Not enough information is provided to determine the direction of travel.
In opposite directions, away from each other.