Question

a train travelling at 20 m/s accelerates at 0.5 m/s2 ( 0.5 metres per second square ) for 30 s. How far will it travel in this time?

Answer 1

u = 20 m/s
a = 0.5 m/s²
t = 30 sec

From 2nd equation,
s = ut +(1/2) at²
  = 20×30 + (1/2)×0.5×(30)²
  = 825 m

Answer 2

Solutions 

We know that a train travelling at 20 m/s accelerates at 0.5 m/s^2 ( 0.5 meters per second square ) for 30 s. 
We have 

u = 20 m/s
a = 0.5 m/s²
t = 30 sec

Solve (calculations)  

s = ut +(1/2) at^²

  = 20×30 + (1/2)×0.5×(30)^²

  = 825 m