A girl weighing $25\ kg$ stands on the floor. She exerts a downward force of $250\ N$ on the floor. What force does the floor exert on her ?

Here, the girl exerts a force of $250\ N$ on the floor. According to Newton's third law of motion, reaction force exerted by the floor on her will be equal to $-250\ N$. Here $(-ve)$ sign indicates the opposite direction.

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