A baby has a mass of 5.0kg. The baby is on a train that is traveling east at 72m/s. What is the baby's momentum

Aspring that is stretched 2.6 cm stores a potential energy of 0.053 j. what is the spring constant of this spring?

You have 80 g of 60oc water and 80 g or 10oc water. what is the final temperature when the two are mixed? explain.

Stephanie lives in california, and her cousin thomas lives in france. which coordinate system would be most useful if the two wanted to observe the same meteor shower and discuss their observations over online chat as they're making them? a. horizontal b. equatorial c. azimuth-altitude d. celestial or azimuth-altitude