Two blocks of masses M_1 and M_2 are connected with a string passing over a pulley as shown in fi...

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Two blocks of masses M_1 and M_2 are connected with a string passing over a pulley as shown in figure. The block M_1 lies on a horizontal surface. The coefficient of friction between the block
M_1 and the horizontal surface is μ. The
system accelerates. What additional
mass m should be placed on the block M_1
so that the system does not accelerate?
(1) M_2-M_1/μ
(2) M_2/μ-M_1
(3) M_2-M_1/μ
(4) (M_2-M_1) μ

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