05 Probilem 5 63 Prevention ot hip injurnes blem 5 63 Prevention of hip injuries

Question

05 Probilem 5 63 Prevention ot hip injurnes blem 5 63 Prevention of hip injuries Part A eople (especially the eldorly) who are prone to falling can ear hip pads to cushion the impact on their hip from a fall xperiments have shown that if the speed at impact can be educed to 1.30 m/s or less, the hip will usually not tracture With what speed does her hip reach the ground? et us investigate the worst-case scenairio, in which a 560 kg person completely loses her footing (such as on icy pavement) and falls a distance of 1.00 m, the distance from her hip to the ground. We shall assume that the person's entire body has the same acceleration, which, in reality would not quite be true m/s My Answers Gvel Part B 2 00 cn Find he acclentisn 2 00 cm Find the acceleration (suned to be coto A A typical hip pad can reduce the person's speed to 1 30 m/s over a distance of person's hip while she is slowing dewn My Answers ve ll Part And find the force the pad exerts on a

Explanation / Answer

a) s = 1m; u = 0 ; a = 9.81m/s

v2 = u2 + 2as

v = (2as)1/2 = (2 * 9.81 * 1)1/2 = 4.43m/s

b) u = 4.43m/s ; v = 1.5 m/s ; s = 2cm = 0.02m

v2 = u2 - 2as (As the person is slowing down a will be negative)

1.52 = 4.432 - 2*a*0.02

a = 434m/s2

Rest of the questions are independant. Please post them separately.

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