Two Masses Are Suspended by a Cord That Passes Over $\mathrm{m}_{1}$

Multiple Choice

Two masses are suspended by a cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, $\mathrm{m}_{1}$ , has a mass of $5.0 \mathrm{~kg}$ and the other mass, $\mathrm{m}_{2}$ , has a mass of $3.0 \mathrm{~kg}$ . The acceleration of $\mathrm{m}_{1}$ is

A) $2.5 \mathrm{~m} / \mathrm{s}^{2}$ upward.
B) $2.5 \mathrm{~m} / \mathrm{s}^{2}$ downward.
C) $3.3 \mathrm{~m} / \mathrm{s}^{2}$ upward.
D) $3.3 \mathrm{~m} / \mathrm{s}^{2}$ downward.
E) $1.1 \mathrm{~m} / \mathrm{s}^{2}$ upward.