You need to draw some triangles and relate b to w. Assuming a still, straight shore, the answer will depend on your distance to the waterline, the ball's dista

You need to draw some triangles and relate b to w. Assuming a still, straight shore, the answer will depend on your distance to the waterline, the ball's distance to the waterline, and the distance parallel to the shore separating your starting spot and the ball's spot.