The last day I arrived in Perth which is in Westen Australia. I also went to Swan River. It was amazing there. I even got so see geese and Dolphins! I also went to the Perth zoo. They even let me touch a real life Sloth!

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.