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Q.

Block A of mass 7 kg is placed on a frictionless table. A thread tied to it passes over a frictionless pulley and carries a body B of mass 3 kg at the other end. What is the acceleration of the system (given g=10 ms−2)?

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Detailed Solution

For  body A:

    Tension = Mass × acceleration 

     Let acceleration =a

     Tension =ma=7a

For body B:

      Force = Mass × acceleration

      Ma=mg−T

      3a=3×10−7a

     3a+7a=30

     10a=30

      a=30/10

a=3m/s²

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