In object is shot up and then return to the ground. What is its acceleration rate the entire time? • 0m/s2
• 10m/s2
• 9.8m/s2
• -9.8m/s2
• -10m/s2

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.