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A force vecF=2hati-3hatj+7hatk(N) acts o...

A force `vecF=2hati-3hatj+7hatk(N)` acts on a particle which undergoes a displacement `vecr=7hati+3hatj-2hatk`
(M). Calculate the work done by the force

A

2 units

B

4 untis

C

-2 units

D

none of these

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