Imagine one two 81 kg astronauts in space. If one astronaut crashes into the other (this astronaut is at rest) what is their resultant combined velocity if they stick together after their collision compared to the initial velocity of the first astronaut? O The new velocity is half the astronaut's initial velocity The new velocity is twice the astronaut's initial velocity O The new velocity is a quarter the initial velocity O The new velocity is 4 four times the initial velocity