"*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!

.