To find the tension in the rope that is pulling a box of mass 50 kg with an acceleration of 1 meter per second squared, you need to use the equation for Newton's second law of motion. This equation states that the force acting on an object (the tension in the rope in this case) is equal to the object's mass multiplied by its acceleration.
If we call the tension in the rope "T," the equation that represents Newton's second law in this situation is T = 50 * 1. Solving this equation, we find that T = 50 Newtons. This means that the tension in the rope is 50 Newtons.