The acceleration of a block attached to a spring is given

Question

Solve the all parts of given question:

Question: The acceleration of a block attached to a spring is given by a = -(0.313 m/s²) cos([2.53 rad/s]t.)

Part A: What is the frequency of the block's motion?

________ Hz

Part B: What is the maximum speed of the block?

________ m/s

Part C: What is the amplitude of the block's motion?

________ m

I need help to determine the amplitude of the block's motion.