PLEASE HELP !! A jet plane traveling horizontally at 1200km/h relative to the ground fires a rocket forward at 1100km/h relative to itself. what is the velocity of the rocket relative to the ground​

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Which atomic model was proposed as a result of j. j. thomson’s work?

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.