While off-roading on a bicycle during a rainy season, it seems inevitable that blotches of mud would stain the back of my shirt at the end of the day. I am not sure the physics behind this.
I am going forward at a speed that is directly related to the rotational speed of the wheel in contact with the ground. The mud is picked up by the wheel and given a spin. But in order for the mud "projectile" to reach my back, it would need to be travelling faster than me in the forward direction.
How is this possible?