A $4.00 \mathrm{~kg}$ Mass Is Connected to a Spring with a Spring Constant

A $4.00 \mathrm{~kg}$ mass is connected to a spring with a spring constant of $9.00 \mathrm{~N} / \mathrm{m}$ . If the initial velocity is $12.0 \mathrm{~cm} / \mathrm{s}$ and the initial displacement is $4.00 \mathrm{~cm}$ , then what is the maximum velocity of the mass?

A) $15.5 \mathrm{~cm} / \mathrm{s}$
B) $19.8 \mathrm{~cm} / \mathrm{s}$
C) $11.5 \mathrm{~cm} / \mathrm{s}$
D) $20.3 \mathrm{~cm} / \mathrm{s}$
E) $13.4 \mathrm{~cm} / \mathrm{s}$