Why is the law of gravity an example of a universal law? a gravity is the attraction of any mass to any other mass. b gravity is a force that affects everyone on earth. c gravity is the reason the earth revolves around the sun. d gravity is a force that exists between any two masses in the universe

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.