1.

Three forces vecA =hati+hatj-hatk, vecB=2hati-hatj+3hatk and vecCare acting on a body to keep it in equilibrium. Then vecC is

Answer»

`-(3hati+4hatk)`
`-(4hati+3hatk)`
`3hati+4hatk`
`2hati+3hatk`

SOLUTION :SINCE body is in EQUILIBRIUM
`vecA +vecB+VECC=vecO`
`vecC=-(vecA+vecB)=-[hati+hatj+hatk+2hati-hatj+3hatk]`
`=-[3hati+0hatj+4hatk)=-(3hati+4hatk)`


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