(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A small 120kg rocket is fired vertically, propelled by an engine with a thrust of 6500N. The engine ejects gas at a rate of 4.5kg/s.

a) Calculate the change in velocity of the gases relative to the engine

b) after 20 s what will be the rockets accleration.

2. Relevant equations

F * delta T = m * delta V

3. The attempt at a solution

(6500-1176)(1) = (120-4.5)delta V

5324= 115.5V

V= 46 m/s

I am not sure if I hav the correct force (because I am not sure if I should subtract Ff), correct mass (because I believe that mass is contant in this formula as there isnt delta M)

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Impulse and Momentum Problem

**Physics Forums | Science Articles, Homework Help, Discussion**