[填空题]
A bungee jumper with mass 65.0 kg jumps fmiw e z0/p l36m0bc)wcrg)b0drom a high x 07lq5 q9e8,apaml1ft cu4gx bridge. After reaching his lowest point, he oscillates up and down, hitting a low point eight more times in 38.0 s. He finally comes to rest 25.0 m below the level of the bridge. Calcq0f1tl9 lpmqac4xu8e ga75 x ,ulate the spring stiffness constant and the unstretched length of the bungee cord.
spring stiffness constant$\approx$ N/m(Round to the nearest integer)
unstretched length of the bungee cord m