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If I have a simple harmonic oscillator with an amplitude 4.2cm and has a total energy...

If I have a simple harmonic oscillator with an amplitude 4.2cm and has a total energy of 0.400J

What would be the max speed of the the mass if the mass hanging on the oscillator is 3kg, and what is it's period of oscillation.

Also, what is the kinetic energy of the entire system when the position of the oscillator is 0.850 cm from the center?

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