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urgent question

i have been trying this question for ages but just cant get the right answer could any of you please help me on this?

thanks

A closed cylinder of 0.25 m diameter is fitted with a light frictionless piston. The
piston is retained in position by a catch in the cylinder wall and the volume on one
side of the piston contains air at a pressure of 750 kN/m2. The volume on the other
side of the piston is evacuated. A helical spring is mounted coaxially with the cylinder
in this evacuated space to give a force of 120 N on the piston in this position. The
catch is released and the piston travels along the cylinder until it comes to rest after a
stroke of 1.2m. The piston is then held in its position of maximum travel by a ratchet
mechanism. The spring force increases linearly with the piston displacement to a final
value of 5 kN. Calculate the work done by the compressed air on the piston.

Answer: 3.07 kJ
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anyone?

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