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so are we gonna put it as:
30t = 400 + 20t

so t = 40s ?

yep, that's what I got

and then from there we can find distance right?
using any equation with distance

right

which velocity do i use to solve for distance ?

i got the distance as 1000m :O

I meant you have to *learn the kinematic eqn..

but still\[x(t)=x_i+vt\]is a kinematic eqn, just a very simple one...

can you show me quickly how to solve using a kinematic equation :O

so we can assume that the acceleration is 0m/s^2

can you check out the other one i posted please. It has something to do with mass