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Two trolley 1 and 2 are moving with acce...

Two trolley 1 and 2 are moving with acceleration `a_(1)` and `a_(2)` respectively, in the same direction. A block of mass m on trolley 1 is in equilibrium from the frame of observer stationary with respect to trolley 2. the magnitude of friction force on block due to trolley is (assume taht no horizontal force other than friction force is acting on block).

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