When the brake are applied to a moving car travelling 60km\hr it decelerate at uniform rate of 5m\s

Answer 1

And your question?
how much time does it take to stop?
vf=vi+1/2 a t^2
0=vi-4.9 t^2 change vi to m/s, solve for t

how far does it go?
Vf^2=Vi^2 +2ad
solve for distance d. Again,change speed to m/s