25 point question A car starting from rest is given a constant acceleration of 4 m/s^2 What is its speed when it has gone a distance of 50 m? How long does it take to go this distance? Tell me what kind of car this might be, and where it might be driving. Be sure to justify your answer.

Which of the following conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space? the cloud is extremely hot. the cloud is visible primarily because it reflects light from nearby stars. the cloud is cool and lies between you and a hot star. the cloud is cool and very dense, so that you cannot see any objects that lie behind it.