Final answer:
The question is missing key details, such as the mass of the box and other forces involved. Typically, acceleration is found using the formula a = F/m, where F is the net force and m is the mass.
Step-by-step explanation:
To determine the acceleration of a box in an elevator when a push force of 600N is applied, we need to know the mass of the box and any other forces acting on it, such as friction and the force due to the elevator's acceleration. However, based on the question, it seems like relevant details are missing to provide a precise answer. Since the force of 600N is the only information given, and the elevator is accelerating upwards, we cannot calculate the box's acceleration without more data regarding these forces and the mass of the box. Normally, this calculation would involve Newton's second law, F = ma, where F is the net force applied to the object, m is the object's mass, and a is the acceleration. If we assume that 600N is the net force (total force after accounting for friction and other factors), and if we had the mass, the acceleration would simply be a = F/m.