Question

Difference between scalar and vector quantity .

Answer 1

scalar quantity : 
the quantity which has only magnitude is called scalar quantity
e.g.  speed; distance; etc.
vector quantity :
the quantity which has both magnitude and direction is vector quantity.
e.g. displacement: velocity; etc.

Answer 2

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A scalar quantity is a one dimensional measurement of a quantity, like temperature, or mass. A vector has more than one number associated with it. A simple example is velocity. It has a magnitude, called speed, as well as a direction, like North or Southwest or 10 degrees west of North.