A 4-Kg Mass Is Connected to a 6-Kg Mass by a Massless

Multiple Choice

A 4-kg mass is connected to a 6-kg mass by a massless cord. A 120-N upward force is applied to the 4-kg mass, causing both masses to accelerate upward. The upward acceleration of the masses is

A) 12 m/s $2$
B) 2.2 m/s $2$
C) 9.8 m/s $2$
D) 5.8 m/s $2$