need help solving (a)

[2/3 Points] DETAILS PREVIOUS ANSWERS OSCOLPHYS2016 16.5.WA.038. MY NOTES ASK YOUR TEACHER PRACTICE ANOT A 0.40-kg mass is attached to a spring with a force constant of k = 227 N/m, and the mass-spring system is set into oscillation with an amplitude of A = 2.0 cm. Determine the following. (a) mechanical energy of the system 4.54 x 10^-2 > Your answer cannot be understood or graded. More Information J (b) maximum speed of the oscillating mass 0.476 m/s (c) magnitude of the maximum acceleration of the oscillating mass 11.35 m/s2