No VIOLENCE please....

Rosenwood was a great scientist.... He invented a gun which was so special that if the bullet was fired from it keeping in mind the image of the person whom you wanted to hit, it will definitely hit him.... But along with this property came an anomaly that the speed of the bullet reduced at a rate at which at every half distance of the bullet and the target, it would slow down such that the next half distance travelled by it would atke the same time as the previous one.... But being such a popular gun, thieves did come to steal it from him.... So having no choice, Rosenwood fired the gun at the thieves.... Given that the starting velocity of the bullet would be 156.25 meters per second(such was the great power of the gun), and the distance betwen the thieves and the nozzle be 25 meters... But the thieves can move away from the path of the bullet at 73 m/min, Can Rosenwood save such great power from going to stray dangerous people??? The question is when will the bullet hit the thieves....