# Homework Help: Rockets and accleration with kinematics

1. Oct 13, 2012

### Watthelol

How would I go about solving a problem like this? What would the answer be?

1. The problem statement, all variables and given/known data
Rockets A and B are fired straight upward from rest at the same time. Rocket A accelerates at 12.2 m/s2, while rocket B accelerates at 15.9 m/s2. Solve for the moment in time when the rockets are separated by 579 m.

A. When are the rockets separated by 579 m?
B. How high up is rocket A at this time?
C. How high up is rocket B at this time?
D. How fast is rocket A moving at this time?
E. How fast is rocket B moving at this time?

I don't seem to understand the problem Thank you!

2. Oct 13, 2012

### rcgldr

What are the formulas for constant acceleration regarding velocity and time and regarding distance and time?

3. Oct 13, 2012

### NasuSama

As one user just said, you need to use the formula given the acceleration and the zero velocity. Find the equation for the distance of each rocket. Then, take the difference between both rocket's distance in terms of time. Finally, you can use the given distance value to determine the answer.