Question

A train accelerated from 20km/hr to 80km/hr in 4 minutes. How much distance does it cover in this period?

Answer 1

a=v-u/t

=80-20/1/15

=60*15

=900kmph²

s=ut+at²/2

=20(1/15)+900(1/15)(1/15)/2

=4/3+2

=10/3km

hope helped!

Answer 2

hi this is your answer\
using formula = v = u + at 
a = v - u/t 
a = 80 -20 /1/15
a = 60 /1/15
a = 60 mutiply 15 
a = 900 km/h^2

now using formula s = ut + 1/2 at^2
s = 20 multiply 1/3 + 900 mutiply 1/15 multiply 1/15
now solve this u will get 4/3 km.

Thanx
harsh