Provides some background for this problem. a ball is thrown vertically upward, which is the positive direction. a little later it returns to its point of release. the ball is in the air for a total time of 7.70 s. what is its initial velocity? neglect air resistance.

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

What is the measure of a change in an objects velocity?

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?