__ is the best example of a nation that uses a democratic type of government.

the best example of a country that is following the democracy system can be the United States of America (USA). Democracy is a system of running and managing the country by electing some head representatives who are considered respectable and reliable to make decisions on behalf of the citizens for the country. The citizens have the right to elect those representatives through voting systems so hence USA has a democracy Style of running the country.  

ek = (m.v2) / 2

v - velocity of system after the collision

m = m1 + m2

ek = (m1 + m2) v2/2

ek = (200 + 250) 2,32/2 = 450*5,29/2 = 1190,25 j

by: nicholas dooley