Balls a, with a mass of 20 kg, is moving to the right at 20 m/s. at what velocity should ball b, with a mass of 40 kg, move so that they both come to standstill upon collision?

Explain to someone who knows nothing about fossils the study of invertebrate paleontology and how it scientists understand the history of the earth. be sure your explanation contains a minimum of two complete sentences.

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

What organization and environment is described above?