[填空题]
A 62-kg bungee jumper jumps from rpn q i(:7g,hha bridge. S*b6n +5jnki kfhe is tied to a bungee cord whose unstretched length is 12 m, and falls a total of 31 m. (a) Calculate the spring stiffness constant k of the bungee cord, assuming Hooke’bji5n fkk+6*n s law applies. $\approx$ N/m
(b) Calculate the maximum acceleration she experiences. $\approx$ m/$s^2$
