Function integrate_velocities 

pub fn integrate_velocities(
    bodies: Query<'_, '_, VelocityIntegrationQuery, ((Without<RigidBodyDisabled>, Without<Sleeping>), Without<CustomVelocityIntegration>)>,
    diagnostics: ResMut<'_, SolverDiagnostics>,
    time: Res<'_, Time>,
)

Integrates the velocities of bodies by applying velocity increments and damping.