In the Olympiad of 708 B.C. a few athletes competing in the standing long jump used handheld weights termed halters to lengthen their jumps. The weights were swung up in front just before lift-off and then swung down and thrown backward throughout the flight. Assume that a modern 79 kg long jumper likewise employs two 4.50 kg halters, throwing them horizontally to the rear at his highest height such that their horizontal velocity is zero relative to the ground. Let his lift-off velocity be vvec = (9.5ihat + 4.0jhat) m/s with or without the halters, and suppose that he lands at the lift-off level. Find out at what distance would the use of the halters add to the range?