the mud from the wheel of a moving vehicle flies off why?
According to Newton,The tendency of a body to maintain its state of rest or of uniform motion in a straight line is called the inertia of the body and also the resistance of a body to change its direction of motion is called inertia of direction.This is applied in your question:
The mud from the wheels of a moving vehicle flies off tangentially. As the mud leaves the wheel, there is no net external force acting on it. Therefore, it follows a straight line path tangent to the wheel at the point of leaving. As a result, mud from the wheels of a moving vehicle flies off tangentially