First slide
NA
Question

A force   F= 2i +3j- 4kN acts on a particle  which is constrained to move in the XOY plane along the line x = y. If the particle moves 52m, the work done by force in joule is
 

Difficult
Solution

 F = 2 i + 3 j - 4 k        as  x=y    s=52       then  s = 5 i + 5 j 

work done = 2x5 + 3x 5 = 25 joule

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