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A block of mass2 kg is from to move al...

A block of mass`2` kg is from to move along the x - axis it is at rest and from `1 = 0` onwards it is subjeted to a time - depended force `F(i) ` in the `x` diretion . The force `F(1) ` varies with `1` as shown in the figure . The kinetic of the block after `4.5` second is

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