  Star-forming galaxies can reach quiescence via rapid transition through
merger-triggered starbursts that consequently affect both their kinematics and
star formation rates. In this work, we analyze the spatially-resolved
kinematics of 92 post-starburst galaxies (PSBs) with data from the MaNGA survey
and place them in context with early-type galaxies (ETGs) to study the impact
of merger history on galaxy kinematics. We measure the specific angular
momentum to characterize them as slow or fast rotators. We find that the MaNGA
PSB sample has $5\%$ slow rotators, which is less than the $14\%$ slow rotators
in the ATLAS$^{3D}$ ETG sample and $22\%$ slow rotators in the MaNGA ETGs. The
PSBs have lower specific angular momentum than the star-forming galaxies (SFs)
and a greater fraction of slow rotators. This implies that for the PSBs to
evolve into the ETGs, they must still lose some angular momentum. While ETGs
with higher stellar mass tend to be slow rotators, PSBs do not follow this
trend. We find significant correlations between specific angular momentum and
mass-weighted age for the SF and ETG samples, but do not see any significant
trends within the short PSB phase. These results indicate that significant
evolution in angular momentum must continue to take place as the galaxy ages
after the PSB phase. For PSBs to evolve directly into ETGs, they must undergo
dry mergers to shed excess angular momentum without causing further epochs of
star formation.
