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.)

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.