Luke's Notes
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Mass Conservation
m
c
v
(
t
+
δ
t
)
=
m
c
v
(
t
)
+
δ
m
i
n
−
δ
m
o
u
t
d
m
c
v
d
t
=
m
˙
i
n
−
m
˙
o
u
t