Engineers are usi g computer models to study train collisions to design safer train cars. They start by modeling an elastic collision between 2 train cars traveling towards each other. Car 1 is traveling east at 6 m/s and has a mass of 3, 154kg. Car 2 is traveling west at 23 m/s and has a mass of 8,296kg. After the collision car 1 has a final velocity of 7 m/s west. What is the final velocity of car 2?

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?