# When a force vector F=(i+2j+k)N acts on a body & produces a displacement of S= (4i+j+7k)m, then the work done is

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by TanyBaby

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by TanyBaby

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The Brainliest Answer!

W=f.d

w=(i+2j+k)(4i+j+7k)

w=4+2+7

w=13

i×i=1, i×j=0, i×k=0

similar for j and k

w=(i+2j+k)(4i+j+7k)

w=4+2+7

w=13

i×i=1, i×j=0, i×k=0

similar for j and k

W=F.S

therefore,

W =i(4x1)+j(2x1)+k(7x1)

but ixi=1

and thus the answer is

W= 4+2+7

=13

therefore,

W =i(4x1)+j(2x1)+k(7x1)

but ixi=1

and thus the answer is

W= 4+2+7

=13