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To determine the mass of the other object, we need additional information. The given information of the object's mass and the speed at which it pulls the other object is not enough to calculate the mass of the second object.
Typically, when determining the mass of an object based on its interaction with another object, we would need to know the force exerted by the first object and the acceleration experienced by the second object. With that additional information, we could use Newton's second law of motion (F = ma) to calculate the mass of the second object.