A man balances himself in a horizontal position by pushing his hands and feet against two parallel walls. His centre of mass lies midway between the walls. The coefficients of friction at the walls are equal. Which of the following is not correct?
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The forces acting on the man at the walls are
$(a)$ horizontal normal reactions of the walls, and
$(b)$ Forces of friction acting upwards. The man exerts equal and opposite forces on the walls.
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