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In an undamped mass-spring system, a metal ball of weight 20nt stretches the spring 40cm and...

In an undamped mass-spring system, a metal ball of weight 20nt stretches the spring 40cm and the system is at rest.

(1) What will the frequency of the resulting harmonic oscillation be? (Use g=10m/sec^2)

(2) If this system is undamped and it is stretched by 20cm again and released with zero initial velocity, find the displacement y(t) of the ball at time t.

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