I have a question in first year college physics about two dimensional motion. It isn't that I don't know the answer it's just that I am not sure that I started correctly and want to make sure I have the right idea so I understand the questions of this nature so I didn't understand exactly what they meant by equation for the velocity as a function of time do they want equation for the magnitude or the vector 1. The problem statement, all variables and given/known data http://img338.imageshack.us/img338/3289/rocketa.png [Broken] 2. Relevant equations I am not sure what they are asking for in part a so I don't know the relevant equations 3. The attempt at a solution V = Vx (i^) + Vy (j^) Vx= v(x0) +a(x)t =1+ 2.5t^3 Vy= V(y0) + a(y)t = 7 + 9t-1.4t^2 so V =(1+ 2.5t^3)*(i^) + (7 + 9t-1.4t^2) *(j^)? or I should make one for the magnitude of velocity since I am not sure I didn't do the one for the position until I know what the question meant I only want to solve part a and b.