Jack cannot run as fast as paul

How are calculation for velocity and speed different

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

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.