A railway car with a mass of 5.8 x 105 kg moving with a speed of 10 m. s-1 strikes another car of mass 8.7 x 105 kg initially at rest. If the two cars couple and move together, what is their common speed after collision?

Describe different biomes. what are some adaptations that organisms (plants or animals) must have to live in each biome?

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f