A hammer can be modeled as a $750\mathrm{g}$ point mass on the end of a $42\mathrm{cm}$ long, $200\mathrm{g}$ uniform rod. How far from the head of the hammer is the center of mass?

• A. $2.3\mathrm{cm}$
• B. $3.1\mathrm{cm}$
• C. $5.6\mathrm{cm}$
• D. $6.3\mathrm{cm}$
• E. $4.4\mathrm{cm}$