Question

help to define the given questions...(1) scalar & vactor quantities.(2) Units of measurement.

Answer 1

scalar quantities are quantities which represent only magnitude and vector quantities are those which represent both magnitude and direction. scalar quantities are represented by a single block letter while vectors are represented by a single block letter with an arrow on top of them.
i am sorry but i couldn't define units of measurements. try finding in Google

Answer 2

vector quantity- those quantities which is depend on both magnitude and direction are called vector quantity
e.g.- displacement, force, velocity etc
Scalar quantity- those quantities which is depend on only magnitude are called scalar quantities
e.g.- mass, time speed etc
unit of measurement- a unit of measurement is a measure of one time of any physical quantity.
for example- unit of velocity is 1m/s