A 6 kg blue ball rolls across the ground and collides with a stationary 1 kg red ball.
Before the collision the blue ball moved right with a speed of 4 m/s, and after the
collision it moved left with a speed of 1 m/s. If the red ball was not moving before the
collision, how fast is it moving after the collision?

The final velocity of the red ball is 18 m/s.What is momentum?The term momentum has to do with the product of the mass and the velocity of an object We know that the momentum is always conserved in accordance with the Newton third law. Also it is clear that the momentum before collision is equal to the total momentum after collision and we are going to apply this principle here.Then;Mass of the blue ball =  6 kgMass of the red ball =  1 kgInitial velocity of the blue ball =  4 m/sInitial velocity of the red ball = 0 m/sFinal velocity of the red ball = ??Final velocity of the blue ball =  1 m/sWe now have;(6 * 4) + (1 * 0) = (1 * v) + (6 * 1)24 = v + 6v = 24 - 6 v = 18 m/sLearn more about momentum:https://brainly.com/question/2193212#SPJ1