A college student wants to toss a textbook to his roommate who is leaning out of a window directly above him. He throws the book upwards with an initial velocity of 8.0
m/s. The roommate catches it while it is travelling at 3.0 m/s [up).
a) How long was the book in the air?
b) How far vertically did the book travel?
c) Redo the problem, and have the roommate catch the book as it is travelling 3.0
m/s [down]. What is the time and displacement now? Do you notice anything?

True or false graphs must include scales that increase by the same amount

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

Which of the following are guidelines to follow for obtaining accurate observations