Aball is tied to a string and whirled in a horizontal circle at a constant 4 revolutions per second. categorize the following according to whether they are 0 in value, constant in value, or change:

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.