Two Masses Are Connected by a String Which Passes Over

Multiple Choice

Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degree frictionless incline. The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg. The acceleration of the 4.00 kg mass is

A) 0.980 m/s² down.
B) 3.92 m/s² down.
C) 0.980 m/s² up.
D) 3.92 m/s² up.
E) 7.84 m/s² up.