Question

If a bus travelling at 20m/s is subjected to a steady deceleration of 5m/s ^2 . how long will it come to rest

Answer 1

u=20m/s
a=-5m/s2
v=0
t=?

apply 1 eqn of motion

v=u+at
0=20+(-5)t

-20/-5=t
4=t


it will take 4s to come to rest.