Abu'l - Barakat also modified Ibn Sina 's theory of projectile motion .
Abu'l - Barakat also stated that the mover imparts a violent inclination ( mayl qasri ) on the moved and that this diminishes as the moving object distances itself from the mover .
Abu'l - Barakat also modified Ibn Sina 's theory of projectile motion , and stated that the mover imparts a violent inclination ( mayl qasri ) on the moved and that this diminishes as the moving object distances itself from the mover .