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M5 help

A particle, of mass 9 kg, is attached to two identical springs. The other ends of thesprings are attached to fixed points, A and B, which are 1.2 metres apart on a smoothhorizontal surface. The springs have modulus of elasticity 45 N and natural length0.4 m.
The particle is released from rest at a distance of 0.5 metres from B and moves onthe line AB. The midpoint of AB is C. At time t seconds after release, thedisplacement of the particle from C is x metres, where the direction from A to B istaken to be positivw.

Show that the resultant force on the particle, at time t, is -225 newtons.

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