Academia.edu hosts a 5-page document titled "SERIE les ondes mecanique progressive" which typically includes physics problems for high school or early university levels.
You can find various PDF resources for "Série Ondes mécaniques progressives" (exercises and courses on progressive mechanical waves) through the following academic and educational platforms: : Download SГ©rie Ondes mГ©caniques progressives pdf
Ac-Montpellier (SPCL) has a concise synthesis sheet ("Fiche de synthèse n°2") covering the differences between mechanical and electromagnetic waves. : Academia
Éditions Ellipses provides a PDF extract that includes corrected basic and oral exercises for progressive mechanical waves. including dispersion and speed calculations.
Prof-TC provides a detailed PDF presentation on the characteristics of these waves, including dispersion and speed calculations.