I have a question in first year college physics about two dimensional motion.(adsbygoogle = window.adsbygoogle || []).push({});

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.

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# Homework Help: Two dimensional motion

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