本题目来源于试卷: gc physics textbook chapter 6 problems，类别为 IB物理学
[问答题]
An engineer is designing a spring t8 b;qe vc3j3qb96jcuio be placed at the bottom opx xi69m r .pym.0,g0tzwvi) sf an elevator shaft. If the elevator cable should break when the elevator is at a height gr.vxx.m ,p0i ytwm69z)sp0ih above the top of the spring, calculate the value that the spring stiffness constant k should have so that passengers undergo an acceleration of no more than 5.0 g when brought to rest. Let M be the total mass of the elevator and passengers.
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