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A mass-spring system with a mass of m =90g is oscillating in SHM. At equilibrium position, the velocity is 70ms⁻¹ and at amplitude position, the acceleration is 720ms⁻². If we have released the mass from amplitude at t=0, Determine the value of:
i) Displacement at t=3s
ii) Acceleration at t=5s
iii) Total energy at t=7s