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 frictionless 30.0 degree incline. The vertically hanging mass is 6.00 kg and the mass on the incline is 4.00 kg. The magnitude of the acceleration of the 4.00 kg mass is

A) 2.98 m/s².
B) 3.92 m/s².
C) 5.88 m/s².
D) 6.86 m/s².
E) 7.84 m/s².