While standing in a low tunnel, you raise your arms and push against the ceiling with a force of 200 n . your mass is 80 kg. what force does the floor exert on you?

According to Newton`s third law, when you push against the ceiling with a force of 200 N, ceiling will also apply 200 N  normal force downward on you.

As your weight is also downward force.

Therefore, when you raise your arms and push against the ceiling with a force of 200 N, the total downward force is equal to the sum of these two forces.

That is

Thus, from Newton`s third law, 984 N is upward force exert on you by floor.

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