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Two forces `hati+hatj+hatk N` and `hati+2hatj+3hatk N` act on a particle and displace it from (2,3,4) to point (5,4,3). Displacement is in m. work done isA. 5JB. 4JC. 3JD. None of these |
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Answer» Correct Answer - 1 `vec(F)=vec(F)_(1)+vec(F)_(2)=2hati+3hatj+4hatk N` `& vec(d)=(5hati+4hatj+3hatk)-(2hati+3hatj+4hatk)` `3hati+hatj-hatk m` `:. W=vec(F).vec(d) =(2hati+3hatj+4hatk).(3hati+hatj-hatk)` =6+3-4=5J |
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