SOLUTION: Evening Everybody Stuck on this question. (trying to get back in to the swing of things so i can enrol on a course) i) Given that F.r is the work done by a force F in movi

Question 366114: Evening Everybody
Stuck on this question. (trying to get back in to the swing of things so i can enrol on a course)
i) Given that F.r is the work done by a force F in moving a body through displacement r. Find the work done by the force F= 3i+7k. if it causes a body to move from the point A with coordinates (1,1,2) to the point B with coordinates (7,3,5)
ii) Obtain unit vectors in each of the directions of f=i+j+3k and s=2i-j+k. Hence show that 48/sqrt66 joules is the work done when a force of magnitude 6 newtons in the direction f moves its point of application a distance 2 metres parallel to s .
Really appreciate help on this.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Find =(,,)-(,,)=(,,)
=(,,)*(,,)=
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.
=(,,)

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=(,,)
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=(,,)
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=(,,)

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.
=(,,)
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.
=(,,)
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.

which is equivalent to

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