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Three blocks of masses `m_1 , m_2` and `m_3` are connected by massless strings on a frictionless table.They are pulled with a force `T_3 = 40 N`.If `m_1 = 10 kg ,m_2 = 6 kg ` and `m_3 = 4 kg`. th tension `T_2` will be :
.

A

20 N

B

40 N

C

10 N

D

32 N

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