A small projectile of mass \(m\) is launched horizontally with speed \(v_0\) toward a block of mass \(M\) suspended at rest from a ceiling by light vertical cords of length \(L\). In Trial 1, the block has mass \(M_1\), and in Trial 2, the block has mass \(M_2\), where \(M_2 > M_1\). In each trial, the projectile embeds itself into the block during a negligible collision interval before the cords swing away from the vertical. Which of the following correctly identifies whether the horizontal linear momentum of the projectile-block system is conserved during the collision, and which trial results in a greater fraction of the projectile's initial kinetic energy being converted into non-mechanical energy?