Q8. The two diagrams in the figure below show a student before and after she makes a bungee jump from a high bridge above a river. One end of the bungee cord, which is of unstretched length 25 m, is fixed to the top of a railin on the bridge. The other end of the cord is attached to the waist of the student, whose mass is 58 kg. After she jumps, the bungee cord goes into tension at point P. She comes to rest momentarily at point R and then oscillates about point Q, which is a distance d below P. BEFORE AFTER & student railing bridge bungee 25m cord extended bungee cord P d student amplitude A R ~ river (a) (i) Assuming that the centre of mass of the student has fallen through a vertical distance of 25 m when she reaches point P, calculate her speed at P