Recently, about 70 metric tons of soil were removed from under a leaning tower, and the angle the tower made with the ground was increased by about 0.5. Before that, a point near the top of the tower was 52.6 m from a point at the base (measured along the tower), and this top point was directly above a point on the ground 4.77 m from the same base point. See the given figure. How much did the point on the ground move toward the base point? The point on the ground moved m toward the base point. (Do not round until the final answer. Then round to two decimal places as needed.)