Question

work is.............quantity scalar or vecror and if vector then why?

Answer 1

Work is a vector quantity because it is Force times Displacement, both of which are vector quantities

Answer 2

Work is a scalar quantity.

It's defined as a dot-product (or scalar product) of force and displacement, both of which are vectors.

A scalar product of two vectors gives a scalar result (aptly named!).!!!

Thinking logically, what would be the direction of work, anyway? You may say, "In the direction of displacement!", but then why not in the direction of force? And if you say the direction of both, well then, it isn't always the same! a force can do work on a body even displacing at an angle to the direction of force.

I hope you get it.

SI UNIT IS JOULES