This is to do with mechanics, which as far as I know is pre-calc, not pre-algebra.

Question: A particle has an initial velocity of and is accelerating in the direction . If the magnitude of the acceleration is , find the velocity vector and the speed of the particle after 2 seconds.

Answer:

velocity vector:

speed of particle:

I am literally stumped on how to achieve this answer. If you can tell me what to do to get there, I will try working it out .