Question

a train starting from a railway station attains a speed of 21 metre per second in 1 minute. Find its acceleration

Answer 1

use this simple formula
v-u/t
21-0/60

Answer 2

Hii there!!

Initial velocity(u)=0m
Final velocity(v)=21m/s
Time(t)=1 mins=60 s

a=v-u/t
a=21-0/60
a=7/20=0.35m/s^2

Hope it helps you......