Question

difference between scalar quantities and vector quantities

Answer 1

it needs direction and magnitude both for measuring-scalar quantity
it needs only direction for measuring-vector quantity
speed - scalar quantity
velocity - vector quantity

Answer 2

$\huge\mathcal{Answer}}}$

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.