Final answer:
The magnitude of the force of the dog on the elevator floor is 98.0N.
Step-by-step explanation:
The magnitude of the force of the dog on the elevator floor can be found using Newton's third law of motion, which states that every action has an equal and opposite reaction. In this case, the force exerted by the dog on the leash is equal in magnitude and opposite in direction to the force exerted by the leash on the dog. Therefore, the magnitude of the force of the dog on the elevator floor is the same as the magnitude of the pulling force exerted by the owner on the leash, which is 98.0N.
Keywords: magnitude of force, dog, elevator floor, pulling force, Newton's third law of motion