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Calculate the work done if a particl...

Calculate the work done if a particle displaces through ` ( 2 hati - hatj + 5 hatk)` meter under a force ` ( 4 hati + 2 hatj - hatk)` newton ( work = ` vecF . vecS`)

Text Solution

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`vecF . vecS = (4 hati + 2hatj -).( 2 hati - hatj + 5 hatk)`
`=(4 xx 2) +(2 xx -1) +(-1 xx 5)`
=1 joule
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