Question

Experimental tests have shown that bone will rupture if it is subjected to a force density of 1.00×10⁸ N/m2 . Suppose a 71.0 kg person carelessly roller-skates into an overhead metal beam that hits his forehead and completely stops his forward motion.

If the area of contact with the person's forehead is 1.50 cm2 , what is the greatest speed with which he can hit the wall without breaking any bone if his head is in contact with the beam for 9.00 ms ?

Answer 1