A joule (J) is a unit of energy.
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W = FD the unit used in force is joule(J), and for force is newton(N), distance is meter(M)
joules (j)
Yes., and their being along the coordinate axes does not change the answer.Consider the vectors: i, -i and j where i is the unit vector along the x axis and j along the y axis. The resultant of the three is j.
"J" is not a math word, but there are several that beginwith 'j'.Mechanics tend to use the letter "j" instead of the imaginary unit "i", when calculating with complex numbers.
It doesn't. (Any unit of force) times (any unit of distance) is a unit of work, and so is any other unit of energy. (By the way . . . 'meters' is not a unit of work.)