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4. A block Of mass m moves at a speed VI . It is subjected to a force Of constant friction F. In order

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4. A block Of mass m moves at a speed VI . It is subjected to a force Of constant friction F. In order to increase its speed from vl to V2 over a distance d, we must perform a total work expressed by B) 1/2(mv22) C) 1/2m(v22-v12) E) 1/2m(V22-v12) + Fd

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