A 800 kg car traveling at 25 m/s rear ends another 500 kg car at rest. The two bumpers lock and the cars move forward together. What is their final velocity?

According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to another? the volume and the shape stay the same. the volume increases to fill the new container, but the shape stays the same. the volume stays the same, but the shape changes to fit the new container. the volume and the shape change to fill the new container.