Prevention of Hip Fractures. Falls resulting in hip

Chapter 2, Problem 2.26

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Prevention of Hip Fractures. Falls resulting in hip fractures are a major cause of injury and even death to the elderly. Typically, the hips speed at impact is about 2.0 m>s. If this can be reduced to 1.3 m>s or less, the hip will usually not fracture. One way to do this is by wearing elastic hip pads. (a) If a typical pad is 5.0 cm thick and compresses by 2.0 cm during the impact of a fall, what constant acceleration (in m>s 2 and in gs) does the hip undergo to reduce its speed from 2.0 m>s to 1.3 m>s? (b) The acceleration you found in part (a) may seem rather large, but to assess its effects on the hip, calculate how long it lasts.