Two blocks`A` and`B` are connected to each other by a string and a spring , the spring

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Two blocks`A` and`B` are connected to each other by a string and a spring , the spring pases and a frictionlesss pulley as down over in the figure . Block `B` sides over the horizental top surface of a strionry block `C` both with the verical side of `C` , both with the same conform speed The coefficient of friction between the surface the of block is `0.2` force constant of the spring is `1960` newtons , if mass of block `A` is `2` kg , celculate the mass of block `F` and `B` and the energy stored is the spring
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