2nd law...
coz both 1st and 3rd r derivable from it...
2 nd law .....
U can prove the first and the 3rd one on the basis of 2nd law :D
[i too thought same[3]]
""""""""brilliant tutorials"""""""" material ka question hai.
ans is as follows::::::::
CERTAINLY,FIRST LAW AS IT DEFINES THE TERMS TO BE USED LATER.....................................................GOOGLYYYYYYYYYY
IT IS CORRECT ...........YAAR 1ST LOM IS MOST IMPORTANT!!!!!!!!
[OTHERWISE 2ND AND 3RD LAWS OF MOTION WUD NOT BE EXISTENT]]]]]]]][3]
of course 1st is the most important
if it hadn't been there then the how would th second law and third law get their respective names :P :P