In summary, physics cannot fully explain the phenomenon of hi back, which refers to the sudden increase in a vehicle's speed when passing another vehicle. While principles such as aerodynamics and drag can partially explain the effect, the complex and unpredictable nature of air flow and turbulence make it difficult to fully understand and predict. Other factors such as driver behavior and road conditions also play a role in hi back, making it a multifaceted phenomenon that cannot be fully explained by physics alone.