Abstract
The purpose of this study was to elucidate strategy for accurate throw by focusing on trajectory of free throw in basketball. The subjects were the six skilled basketball players belonging to a university basketball club and the recreational basketball player. The subjects were required to sink a free throw. The behavior of the thrown ball was recorded by four normal-speed video cameras placed beside the shooter and analyzed using the three-dimensional direct linear transformation method. The results were as follows: 1) Initial velocity ranged 0.2 to 0.6 m/s, and release angle ranged 3 to 9 degrees. This result differed from previous research. Then, it is necessary to consider including not only initial velocity and release angle, but also release point. 2) All subjects tended to change release point forward as the distance to the ring increased. In order to increase initial velocity, it is thought to push the ball longer and carry the ball in a straight line.
