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**1. An elastic cord oscillates up and down with a frequency of 7.4 Hz when a mass of .6 kg is hung from it. What is the frequency if only .38 kg hangs from it?**

**2.A mass attached to the end of a spring is stretched a distance .46 meters away from equilibrium and released. At what distance from equilibrium will its acceleration be equal to half of its maximum acceleration?**

**Equations**

Again, please suggest any other equations I need, I am so frusturated right now.

KE = (1/2)mv

^{2}

_{max}

μ

_{spring}= (1/2)kx

^{2}

V

_{max}= 2πfA , [f = frequency, A = amplitude]