Question

how to apply the 3 equations of velocity in problem??

Answer 1

just replace the values given for the various units and calculate

Answer 2

Hey
1)if we are given with initial velocity (u), acceleration (a), and time(t) we can find final velocity (v) by using : v=u+at.
If we want know displacement (s) then ,u, a, t can be applied in formula :s= ut+1*a*t²/2
3)If we know u, a, s then we can find v by :
v²=u²+2as.
Hope it helps :)