A person stands on a platform and pulley system as shown in the figure. The masses of platform, person and pulley are M, m and $μ$ respectively. The rope is massless. Let the person pull up on the rope so that he has acceleration 'a' upwards. Tension in the rod connecting the pulley to the platform is :

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​ T − ( M + m + μ ) g = ( M + m + μ ) a ​ T − ( M + m + μ ) ( g + a ) ​ ​ 2 T − T − μ g = μ a ​ T = ( 2 M + 2 m + m ) ( g + a ) ​

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