diff --git a/Ball.cpp b/Ball.cpp
index 1e2496b..350f990 100644
--- a/Ball.cpp
+++ b/Ball.cpp
@@ -83,6 +83,8 @@ void Ball::update_pos(double dt) {
         _compute_T_n();
         _compute_v_x(normal);
         _compute_v_z(normal);
+        min_height = fmin(radius, min_height + 0.2 * (radius - min_height));
+        std::cout << "U:" << U << "\n";
         max_t = (T - old_t)/2.0 + old_t;
 
         if (((A + B * max_t - (G_CTE / 2) * max_t * max_t + min_height) < radius)) {