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For an object with simple harmonic motion; a) What can you say about its speed, acceleration...

For an object with simple harmonic motion;

a) What can you say about its speed, acceleration and kinetic energy at equilibrium?

b) For simple harmonic motion given by x = 3,8 cos (5πt / 4 + π / 6), what is its amplitude, frequency, position and speed for t = 0?
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