Question

what is the difference between vector and scalar quantity?

Answer 1

Scalar: a physical quantity which have only magnitude but no direction.eg: speed,mass,distance.
vector: a physical quantity which have both magnitude and directon.eg: displacement, velocity.
i hope it helps u

Answer 2

A scalar quantity is a quantity in which we denote only the magnitude and not the direction of it.
For example, u r travelling 50 km north and 40 km west and 10 km south. The total distance covered is the sum of all the three above.
But, in vector notation one need to specify both d magnitude and the direction in which it is acting. 
For eg, the displacement for the above example is the shortest distance between the starting and the final point.