Final answer:
The question pertains to Physics, specifically Newton's laws of motion, and is at a high school level. Although a force of 200 N is applied to the ceiling, without movement of the ceiling, it is an illustration of equilibrium where no net force results in acceleration, and therefore no change in motion occurs for the person.
Step-by-step explanation:
The subject of your question is Physics, as it pertains to Newton's Second Law of Motion, which relates force, mass, and acceleration. This concept is often discussed at a high school level. The force you exert upwards is countered by an equal and opposite force by the ceiling onto you, as per Newton's Third Law of Motion. If you're pushing against a stationary ceiling with a force of 200 N, this force doesn't cause any acceleration in your body unless the ceiling moves. Here, the force you apply on the ceiling, and that the ceiling applies on you, is essentially a way to emphasize the equilibrium status where the net forces are zero since you remain stationary and do not accelerate. Your mass of 70 kg is an additional detail that could be used to calculate force due to gravity (weight) if necessary. For example, the force of gravity acting on you is weight (w) = mass (m) × gravity (g), which equals 70 kg × 9.8 m/s² = 686 N.