HELP PLEASE!
Scientist use different types of models to study the composition of matter and how matter behaves. Three different types of molecular models and their uses are shown. match each type of model with its use.

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

The discovery of the electron as a subatomic particle was a result of