In order to calculate the rocket velocity, we can use the momentum formula below:
[tex]p=mv[/tex]
Where m is the mass and v is the velocity.
So, for p = 21 * 10^7 kg*m/s and m = 28,000 kg, we have:
[tex]\begin{gathered} p=mv \\ v=\frac{p}{m} \\ v=\frac{2.1\cdot10^7}{28000} \\ v=750\text{ m/s} \end{gathered}[/tex]
Therefore the rocket velocity is 750 m/s.
(answer already in 2 significant figures)
