일반물리학 1 — Rolling, Torque, and Angular Momentum: Problem 27

27 A particle of mass m is shot from ground level at initial speed u and initial angle \( \theta \) relative to the horizontal. When it reaches its highest point in its flight over the level ground, what are the magnitudes of (a) the torque acting on it from the gravitational force and (b) its angular momentum, both measured about the launch point?