A scalar quantity describes magnitude, while a vector quantity does not.

(a)  

A vector quantity is described with a direction and a scalar is not.

(a)  

Scalar quantities are path dependent quantities and vector quantities are not.

(a)  

A scalar quantity depends only on the initial and final values of the quantity; this is not the case for vector quantity.

(a)  

The quantity 20 m/s north describes speed and, as such is a scalar quantity.

(a)  

The quantity 9.8 m/s is an acceleration value and, as such, is a vector quantity.

(a)  

Acceleration is a vector quantity.

(a)  

Accelerating objects must change their speed.

(a)  

Accelerating object must change their velocity.

(a)