Aball is thrown straight upward so that it goes up and then comes back down. on the way up, the ball slow down. on the way down, the ball speeds up. does the direction of the acceleration vector change during this process?

Friction removes energy from objects in motion. which statement best describes how this works? a) friction transforms ke into thermal energy b) friction transfers thermal energy to ke c) friction transforms te into pe d) friction transforms pe into ke e) friction transfers ke into pe