Question

an automobile accelerates from 20 m\s to 50 m\s in 5seconds .what is its acceleration

Answer 1

acceleration formula is v-u/t
from given question :final velocity is 50m/s(v)
                                :initial velocity is 20m/s(u)
                               : time is 5 seconds
50-20/5
30/5
6m/s
                                

Answer 2

u = 20 m/s
v =50 m/s
t = 5 sec

From 1st equation of motion,
v= u+at
⇒50 = 20 + 5a
⇒5a = 30
⇒a = 6 m/s²