A 3,000-kg railway car is traveling on a level track with a velocity of 8.0 m/s to the right when it collides head-on with another railway car of mass 5,000 kg that is traveling with a velocity equal to 4.0 m/s to the left. When the two cars collide, they couple together via internal hooks that are attached to the colliding faces of each car. What is the velocity of the tandem of cars after the collision

frequency or wavelenth of em radiation in a vacuum

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

the journeys of marquette, joliet and la salle a) new france expand.

all three of these explorers explored the midwest and the area around the great lakes, which they subsequently claimed for france.

this was a big portion of territory and expanded new france which before then only consisted of quebec province in northeastern canada