Editing Delta-v (section)

==Definition==
<math display="block">\Delta{v} = \int_{t_0}^{t_1} \frac{|T(t)|}{m(t)}\, dt</math>
where
*{{math|{{var|T}}({{var|t}})}} is the instantaneous [[thrust]] at time {{math|{{var|t}}}}.
*{{math|{{var|m}}({{var|t}})}} is the instantaneous [[mass]]  at time {{math|{{var|t}}}}.

Change in velocity is useful in many cases, such as determining the change in [[momentum]] ([[Impulse_(physics)|impulse]]), where: <math>\Delta \mathbf{p} = m \Delta \mathbf{v}</math>, where <math>\mathbf{p}</math> is momentum and m is mass.{{clarification needed|date=January 2025|Mass is not assumed to be constant so what is this "m"? Newton's second law is not applicable directly to the rocket only because mass is not constant, so this relation is not valid in this case.}}