7. Who has the greater average velocity: an astronaut who has jut completed an orbit of the Earth or you when you have just traveled from home to school? Explain.​

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.