1.

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

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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