Problem $13($Halliday Problem $15\mathrm{.}5)$

In an electric shaver, the blade moves back and forth over a distance of $2\mathrm{.}0$ mm in simple harmonic motion, with frequency $120$ Hz $.$ Find $($a$)$ the amplitude, $($b$)$ the maximum blade speed, and $($c$)$ the magnitude of the maximum blade acceleration.