To find the change in length (delta*L), we can use Hooke's Law formula:

F = k deltaL

Where:
F = Force applied
k = spring constant (2000000 N/m)
delta*L = change in length

We know the force applied is the weight of the mass, which is given by:

F = m g
F = 10000 kg 9.81 m/s^2
F = 98100 N

Now we can set the two equations equal to each other:

k deltaL = 98100 N

Solving for delta*L:

deltaL = 98100 N / 2000000 N/m
deltaL = 0.04905 m or 4.905 cm

Therefore, the change in length (delta*L) is 0.04905 meters or 4.905 cm.