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Constant force barF(1) = 4bari +barj -3b...

Constant force `barF_(1) = 4bari +barj -3bark and barF_(2) = 3bari +barj -bark` act on a particle. If the work done where the particle is displaced from A to B, the position vectors of A and B being `bari + 2barj +lambda bark and 5bari+4barj+bark` respectively is 40 unit then find `lambda`.

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