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Two blocks M1. and M2, are tied with str...

Two blocks `M_1`. and `M_2`, are tied with string and kept at rough surface as shown in figure. If F = (2t)N is applied on the block of mass `M_1`, then the friction force on the blocks at t = 2 s. is

A

0.25

B

0.4

C

0.75

D

0.2

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