For W1, which has a mass of 85kg and is excited by a rotating unbalance of 23g-m at a speed of 1800 RPM (the exciting force has the form F.e^(jot), where j=\sqrt(-1)), what is the mass of the auxillary mass W2 attached to it?

A) 21.5Kg
B) 85kg
C) 23g-m
D) 1800 RPM