Consider Two Blocks Hung by a Massless String from a Frictionless

Multiple Choice

Consider two blocks hung by a massless string from a frictionless pulley as shown in the figure.The masses of the blocks are m₁=5 kg and m₂=7 kg.The bottoms of the blocks are 20 meters above the top of the table.While m₂ is accelerating downward,what is the magnitude of the tension in the string (within 5% accuracy) ?

A) 57 N
B) 49 N
C) 69 N
D) 80 N
E) 5