1.

A person (40 kg) is managing to be at rest between two vertical walls by pressing onewail A by his hands and feet and the other wall B by his back (fig.). Assuming that thefriction coefficient between his body and the walls is 0.8 and that limiting friction acts atall the contacts. (a) Show that the person pushes the two walls with equal force. (b) Firsdthe normal force exerted by either wall on the person. Take g = 10 ms:Q.14

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