In the absence of air resistance, an old textbook is launched as a projectile over level ground. Its impact point is 25 m from the launch point. Now suppose the launch speed is doubled (and the projectile is fired at the same angle above the level ground). What is the new range of the launched book

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.