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Two blocks A and B of mass 2 kg and 4 kg...

Two blocks `A` and `B` of mass `2 kg` and `4 kg` are placed one over the others as shown in figure. A time vaying horizontal force `F=2t` is applied on the upper blocks as shown in figure. Here `t` is in second and `F` is in newton. Coefficient of friction between `A` and `B` is `mu=(1)/(2)` and the horizontal surface over which `B` is placed is smmoth. `(g=10 m//s^(2))`. If acceleration of blocks `A` as a function of time is given by `a_(A)=t//c` then find value of `c`. `(t le7.5s)`

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