6 A bungee jumper of weight \(W \mathrm {~N}\) is joined to a fixed point \(O\) by a light elastic rope of natural length 20 m and modulus of elasticity 32000 N . The jumper starts from rest at \(O\) and falls vertically. The jumper is modelled as a particle and air resistance is ignored.
- Given that the jumper just reaches a point 25 m below \(O\), find the value of \(W\).
- Find the maximum speed reached by the jumper.
- Find the maximum value of the deceleration of the jumper during the downward motion.