Atrain is accelerating at a rate of 2 m/s. if it's initial velocity is 20 m/s, what is its velocity after 30 seconds?

We don't know anything about the direction of the track, so we can't say anything about the train's 'velocity'.  The best we can do is talk about its speed.

Speed = (initial speed) + (acceleration) x (time spent accelerating)

Speed = (20 m/s) + (2 m/s²) · (30 sec)

Speed = (20 m/s) + (60 m/s)

Speed = 80 m/s

(This is about 179 miles per hour, so if this is not a bullet train of some kind, then get ready for an ugly crash.)

divide the right side by the left side

0.024÷1.2=0.02 for example

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000