Q: Is j a work unit

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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.

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.)

"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.

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SI unit for work is joules. It is written as J.

The SI unit for work in physics is Joule (J).A joule in base units 1 kg.m2.s-2.

If you mean work as in energy it is joules (j).

The SI unit for work is the joule. The Joule is abbreviated as " J ".

That unit is called the watt - it's a unit of power.

Joules (J) or Newton Metres (Nm)

watt

I found the answer from http://en.wikipedia.org/wiki/Mechanical_work, which says the SI unit for work done is J (joule) or sometime Nm (newton metre)

Joules (J) . . . . but a Joule is quite a small amount of energy, so kilojoule is more common (kJ).

The same as the SI unit for energy - the joule.The same as the SI unit for energy - the joule.The same as the SI unit for energy - the joule.The same as the SI unit for energy - the joule.

work and energy have same unit which is jole denoted by "J"

Joules (J) This is because work is energy transferred, and energy is measured in Joules.