update the default dt in 3-2_collision

3-2_collision/main.cpp

@@ -6,7 +6,7 @@ class CollisionGui : public Gui {
    public:
     float m_angle = 1.047f;
     float m_force = 10.0f;
-    float m_dt = 1e-1 * 3;
+    float m_dt = 1e-3 * 5;
     float m_mass = 1.0;
     bool m_showContacts = false;
     bool m_useAABB = false;