Three blocks of masses m1, m2 and m3 are connected by massless strings as shown on a frictionless table. They are pulled with a force T3 = 40 N. If m1 = 10 kg, m2 = 6 kg and m3 4 kg, the tension T2 will be 

(1) 20 N

(2) 40 N

(3) 10 N

(4) 32 N

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Types of forces
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