The law of conservation of momentum states that the total momentum before a collision is equal to the total momentum after the collision.
In this case, the momentum of the objects before the collision is (mass1 * velocity1) + (mass2 * velocity2), and after the collision, when the objects stick together, the momentum is given by (mass1 + mass2) * velocity_after.
Looking at the chart, the masses of the two objects add up to 2,000 grams or 2 kilograms, and the velocity after the collision is given as 1.5 m/s.
Therefore, the momentum of the objects after the collision is (2 kg) * (1.5 m/s) = 3 kg · m/s or 3,000 kg · m/s.