# Rocket Propulsion Gas Injection

1. Apr 4, 2009

A rocket is fired in deep space, where gravity is negligible.

If the rocket has an initial mass of 6000 kg and ejects gas at a relative velocity of magnitude 2000 m/s , how much gas must it eject in the first second to have an initial acceleration of 25.0 m/s^2?

2. Apr 4, 2009

### tiny-tim

Welcome to PF!