Initial Velocity Vector

[Emerson]

The last problem on my homework is a physics problem, but I'm failing to see the connection to the material and this context.

A rocket takes off from the origin at time t=0 seconds with an initial velocity vector and subsequently subject only to the force of gravity, which we take to be exactly -9.8 m/s^2 in the downward direction.The rocket reaches its highest point at the point (11800, 8400, 1960). Find its initial velocity vector:
r(0) = <__, __, __>

Please provide any information you can to help me start this problem.​ I dont see how I use the information provided

 

[tkhunny]

You are in a calculus class? This is a derivative or anti-derivative problem. There is a standard relationship between acceleration, velocity, and displacement. Do you know this relationship?

Are you sure the initial vector has 3 components?

 

[Emerson]

I'm in multivariable and I understand the relationship, I'm just not sure how to use the info provided in the question.
Also, the answer field has three blanks as i typed in the original question.