What is the average speed of human sneeze?
Mainstream understanding is that a sneeze is 100 mph, or ~45 m/s. However, this isn't even close to being true..

A study in 2013 (see link below) was conducted where they investigated the airflow dynamics of sneezing and breathing, and discovered that the highest velocities of a sneeze are around 10 mph, or 4.5 m/s.


  ...the maximum sneeze velocity derived from these measured distances was 4.5 m/s.


So, about 1/10th the value of what most people believe.. just like the 10% use of our brain misconception, but reversed! (we use 100% of our brain.. not necessarily all at the same time, but we do utilize all parts of our brain)

Airflow Dynamics of Human Jets: Sneezing and Breathing - Potential Sources of Infectious Aerosols