A car drives 30 meters north, then turns around and drives 50 meters south. What was its distance?

Which of the following are appropriate acceleration units?

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of