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Assume that a 50-kg runner trips and falls with his extended hand into a wall (without

slowing down). If the bones of his two arms absorb all the forward kinetic energy, what is the

minimum speed of the runner that will cause a fracture of the arms? Assume that the length of

one arm is 1 m and that the area of each bone is 4 cm2

, on average.

aB = 16x107

Pa for the arm

a = F/A = (1.33 × 104

N) / (2.4 x 10^-4

m2

) = 5.5 x 107

Pa

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