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Two blocks A (1 kg) and B (2 kg) are con...


Two blocks A (1 kg) and B (2 kg) are connected by a string passing over a smooth pulley as shown in the figure. B rests on rough horizontal surface and A rest on B. The coefficient of friction between A and B is the same as that between B and the horizontal surface. The minimum horizontal force F required to move A to the left is 25 N. The coefficient of friction is:

A

0.67

B

0.5

C

0.4

D

0.25

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