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A force k j c i F ˆ 2 ˆ ˆ 3 ) (     acting on a particle causes a displacement: k j i s ˆ 3 ˆ 2 ˆ 4 ) (      in its own direction. If the work done is , 6 J then the value of ' ' c is

1. 0
2. 1
3. 6
4. 12

Correct answer: 6

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