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Simple Harmonic Motion help!

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1. Can someone help with these questions please?

1. A mass of 0.50kg vibrates in SHM with a maximum KE of 3.0mJ. If its amplitude is 20mm, calculate the frequency of the motion.

And
2. A mass oscillates in SHM on the end of a spring of force constant 40 Nm^-1. If the amplitude of the motion is 30mm, calculate the max KE of the mass. (Hint: w^2 = k/m)

Thanks!
2. For (1), if you know the maximum KE of the mass and it's mass, you can work out it's maximum velocity. There is an equation for the maximum velocity of an object undergoing SHM in terms of amplitude and frequency, which should get you to the end of the question.

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