Answer to Question #80939 in Mechanics | Relativity for Shalo minette

Question

A bungee jumper of mass m, jumps without an initial speed from a bridge at time t0=0; his Centre of gravity G is situated at height h0 in relation to the river that passes under the bridge. From t0 to t1; the elastic is not stretched and the diver is in free fall. At time t1 the diver is at a point G, with height h1 and his speed is null. From t1 to t2, the elastic is stretched and slows the fall of the diver, at time t2 the point G is at h2; the elastic has a negligible mass with regard to that of the jumper and it has a elasticity constant k=60N/m and length L0=25m without the load. Given, m=75kg , h0=70m and g=9.8m/s2, calculate the value of the variation of potential energy of gravity of the system during the first phase.
b) Also calculate the speed v1 reached by the jumper at time t1.
c) calculate the value of the stretch, L.
Ignore all friction in this exercise.