Answer:The distance is 15.21m
Explanation:Given that,
Height of bridge h =100m
Length = 30m
spring constant= 40N/m
Mass = 80kg
suppose we need to find the distance when the cord reaches its maximum elongation.
We need to calculate the distance
D= h+x
D= 100+x
We need to calculate the gravitational potential energy
using formula of gravitational potential energy
P.Ei = mgh
put the value into the formula
P.E = 80*