When a pitcher throws a baseball, it reaches a top speed of 42 m/s. If the baseball takes 2 seconds to travel from the pitcher to the catcher, what is its acceleration? (Assume the ball is moving at O m/s right before it leaves the pitcher's hand.) O A. 15 m/s2 O m B. 48 m/s2 O c. 36 m/s D. 21 m/s2 SUBMIT​

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.