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Write a full page that sumerizes thermodynamics it’s from the website visionlearnig

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.

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car