In billiards (pool) there is a collision between the cue ball (white) and all the other balls on the break. before the collision, only the cue ball is moving. after the collision, all the balls have velocity. which statement is true about the momentum before and after the collision? when the cue ball contacts the other balls, momentum is transferred causing them to gain momentum and speed. each pool ball gains as much momentum as the cue ball loses. after the collision, there is more momentum than before the collision. 2. a train car moving along at 3 m/s runs into another train car at rest on the track. the cars attach together and continue moving in the same direction. the velocity of both cars together after the collision is less than 3 m/s. exactly 3 m/s. more than 3 m/s.

What are genotypes? what are phenotypes?

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

80 points pls brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?