"What is the frequency of a 0.85-kg block bouncing on the end of a 3.8 Newton meter spring?"
Frequency is \(\omega=\sqrt{\frac{k}{m}} \text{ radians/sec or: }f=2\pi \sqrt{\frac{k}{m}}\text{ cycles/sec}\)
(m is mass, k is spring constant)
I'll leave you to fill in the numbers!
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