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Work done by a force vecF = (hati + 2hat...

Work done by a force `vecF = (hati + 2hatj - 5hatk)N` to displace a body through displacement `vecS = (2hati + 2hatj + 2hatk)` is

A

`2J `

B

`- 2J`

C

`4J `

D

`- 4 J `

Text Solution

Verified by Experts

The correct Answer is:
D
`W = vecF. vecS`
`W = (hati + 2hatj - 5hatk) .(2hati + 2hatj + 2hatk)`
`therefore W = 2 + 4 - 10 = - 4 J`
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