In terms of energy, bungee-jumping involves both potential and kinetic energy. As the athlete reaches his altitude, and aproaches the edge, his potential energy is at its maximum peak. as the jumper then takes off, his kinetic energy increases and potential energy decreases so the faller now accelerates to the earth and gains velocity while the conserved energy is converted from potential energy to kinetic.
Momentum also is significant in this sport. As the jumper falls freely, his velocity increases along with his momentum and requires a greater force too counter act their forward motion. The change in momentum is known as impulse and in this sport, the bungee chord is the key instrument which slows down the impulse and keeps the person in tact and changes their momentum. Also, the elastic force springs back the jumper and what causes them to sling backward until they slow down enough and reach the happy medium.Unfortuately sometimes the momentum is too great and the chord cant resist the forward momentum and may snap where then people get hurt. Gravity accelerates the jumper to extreme measures and the person can free fall to huge lengths and still survive, amazing