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Earlier discussion
2 older comments kept for context.
Feyi Oladipo
Work done= force distance
Force=10^5Nm^-2
Distance=1.2m^3-0.6m^3=0.6m^3
=10^50.6
=6*10^4J
Iyosayi Onaiwu
W = P × ∆A
W= work
P= pressure
∆A = Change in area