An undamped mass spring system is released from rest from an initial displacement of x = 0.24 m and starts to oscillate. You see that the mass reaches its largest positive displacement for the first time, 0.341 seconds after release and its largest negative displacement 1.341 seconds after release. If the mass attached to the spring is 1 kg, what is the stiffness of the spring? What is the amplitude of the oscillations (largest displacement)?