Sobre un cuerpo actuan dos fuerzas horizontales en sentido contrario , hacia la derecha se ejerce una fuerza de 18 n y hacia la izquierda una fuerza de 6 n, calcule la direccion y magnitud de la fuerza resultante

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.