A number of discs, each of momentum M kg m/s are striking a wall at the rate of n discs per minute. The force associated with these discs, in new tons, would be

• A.  \[\frac{Mn}{60}\]                             
• B.         \[60\,mn\]
• C.  \[\frac{M}{60\,n}\]                       
• D.  \[\frac{n}{60M}\]