Question

Is work a scalar quatity? If yes, then how

Answer 1

Work may be scalar or vector both. It depends that if the following work has a direction also or only magnitude.

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Answer 2

force and distance are taken to be vector quantities, and combined using the dot product: 
where φ is the angle between the force and the displacement vector. This formula holds true even when the object changes its direction of travel throughout the motion. 
In mathematics, the dot product, also known as the scalar product, is a binary operation which takes two vectors over the real numbers R and returns a real-valued scalar quantity. 

so u see work is scalar which is a product of two vectors

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