A force barF = (bar5 I + bar3 j + 2 bar...

A force `barF = (bar5 I + bar3 j + 2 bark ) N` is applied over a particle which displaces it from its original to the point ` bart = (2 bari - bar j ) m `. The work done the particle in joules is

` + 10`

` + 7`

`-7`

` + 13 `

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The correct Answer is:

(b) Work done in displacing the particle ,
`W = barF barx = (5 hat I + 3 hatJ + 2 hat k ) (2 hati - hatJ)`
`= 10 - 3 = 7 joules`

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