The unit of mass"kilogram" is a fundamental unit. why?​

kilogram is a fundamental unit because it is one of the 7 fundamental units that serve as a building block for derived units.

Explanation:

Fundamental units are used to measure fundamental quantities. They are fundamental units because they serve as a building block for derived units.

7 fundamental quantities and their corresponding units;

Length – meter

Mass – kilogram

Time - seconds

Temperature - Kelvin

Amount of substance - Moles  

Electric Current - Ampere  

Luminous intensity -  Candela

Thus, kilogram is a fundamental unit because it is one of the 7 fundamental units.

u=13

v=30

s/t=u+1\2at

=13+431/2

=13+265.5

=278.5

it is very well related to a lot of things but with my limited knowledge i can confidently say that the answer is space.