Atrain moving west with an initial velocity of 20 m/s accelerates at 4 m/s2 for 10 seconds. during this time, the train moves a distance of what

Ok so we know:
The initial velocity (u) is 20m/s
The acceleration (a) is 4m/s2
The time taken (t) is 10 seconds.

We want to find 'r', the displacement/distance travelled during this period.

So we can use the equation:

So:

So r is 400 metres.

So the train moved 400m during this time.

Hope this helped