A machine has mechanical advantage 2.What does that mean​

Mechanical advantage is the measure of the force amplification achieved by using a tool , mechanical device or machine . The machine preserve the input power and supply trade off force. against movement to obtain a desired amplification in the output force .

found in the nucleus

has mass of one amu

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.