Look at the lines in the image, and answer the questions that follow. Reading from left to right, describe the spacing between the dots in lines 1, 2, and 3.

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.

What are similarities and differences of reflection, refraction, diffraction and absorption?