- #1
j3dwards
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Homework Statement
A rocket moving in space, far from all other objects, has a speed of 3.0 × 103 ms−1 relative to the Earth. Its engines are turned on, and fuel is ejected in a direction opposite to the rocket’s motion at a speed of 5.0 × 103 ms−1 relative to the rocket. What is the speed of the rocket relative to the Earth once the rocket’s mass is reduced to half its mass before ignition?
Homework Equations
vfuel = v - vex
The Attempt at a Solution
Quite unsure as to how to attempt this. How do I found vex in order to find v? It has something to do with the mass but I'm not sure how to relate it.
This question is only worth 2 marks so I don't think I'm expected to show much. Thank you.