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We determine the CKM matrix-element magnitude $|V_{cb}|$ using$\overline{B}^0\to D^{*+}\ell^-\bar\nu_\ell$ decays reconstructed in $189 \,\mathrm{fb}^{-1}$ of collision data collected by the Belle II experiment,located at the SuperKEKB $e^+e^-$ collider. Partial decay rates are reported asfunctions of the recoil parameter $w$ and three decay angles separately forelectron and muon final states. We obtain $|V_{cb}|$ using theBoyd-Grinstein-Lebed and Caprini-Lellouch-Neubert parametrizations, and find$|V_{cb}|_\mathrm{BGL}=(40.57\pm 0.31 \pm 0.95\pm 0.58)\times 10^{-3}$ and$|V_{cb}|_\mathrm{CLN}=(40.13 \pm 0.27 \pm 0.93\pm 0.58 )\times 10^{-3}$ withthe uncertainties denoting statistical components, systematic components, andcomponents from the lattice QCD input, respectively. The branching fraction ismeasured to be ${\cal B}(\overline{B}^0\to D^{*+}\ell^-\bar\nu_\ell)=(4.922 \pm0.023 \pm 0.220)\%$. The ratio of branching fractions for electron and muonfinal states is found to be $0.998 \pm 0.009 \pm 0.020$. In addition, wedetermine the forward-backward angular asymmetry and the $D^{*+}$ longitudinalpolarization fractions. All results are compatible with lepton-flavoruniversality in the Standard Model.

Determination of $|V_{cb}|$ using $\overline{B}^0\to D^{*+}\ell^-\bar\nu_\ell$ decays with Belle II