Question

u=54 ; v=0 ; t=10s ; a=? (m/s²)

Answer 1

u = 54km/h = 15m/s
v = 0
t = 10s
so a=( v -u)/t
= (0-15)/10 m/s²
= -15/10 m/s²
= -1.5m/s²

Hope it helps!!

Answer 2

We can do it by first equation of motion i.e. V=U+AT

0=54+a x 10

0 = 54+10a

-54=10a

a = -54/10

so,a= - 5.4 m/s^2