When using a Physical contact with the Penalty method, by default the penalty coefficient will be computed automatically, in regards to the softest material of the simulation. There are three automatic calculation options for the coefficient: “High”, “Moderate” and “Low”.
If after your simulation you want to find the value that was used for this run, there is a way to do so.
In the Event Log, in the section called “DEFI_CONTACT” search for the parameter that is called “COEF_PENA_CONT”. This will reveal the value of the penalty coefficient 
