posted by Anonymous .
Ok. I'm writing that big test tomorrow, and I have no idea what should I do with this :
An alien is 5m from an astronaut. The astronaut notices the alien and they simultaneously begin to run from each other with v[alien]= 2m/s and v[astronaut] = 4m/s. Find their mutual distance 20seconds later.
Please help, IT'S TOMORROW :getting dramatic: