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Why Com Is an Important Point

Two masses A ...

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Two masses A and B of mass 4 kg and 1 kg respectively are connected with the help of massless inextensible string. Mass A is placed on a rough horizontal table and mass B is hanging with the help of string passing through a smooth hole at the centre of table. For the system to be in equilibrium what can be the minimum value of coefficient of friction?(1) 0.5(2) 0.25(4) 0.125(3) 2.5

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