[填空题]
A 62-kg bungee jumper jumps from a br9 adr wvs8e2tm i( s7snv*+ks,idge. She is tied to a bunger-c8jjwp*bt ; e cord whose unstretched length is 12 m, and falls a -bjptrj;w* c8 total of 31 m. (a) Calculate the spring stiffness constant k of the bungee cord, assuming Hooke’s law applies. $\approx$ N/m
(b) Calculate the maximum acceleration she experiences. $\approx$ m/$s^2$
