#15) Homer Simpson is asleep at the Springfield Nuclear Power Plant (where he's known to occasionally work.. although mostly he's asleep at the controls). When the power plant sounds an alarm (doh!),
what is happening, and what must Homer do to save the day?

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?