Block A, with a Mass of 10 Kg, Rests on a 30

Multiple Choice

Block A, with a mass of 10 kg, rests on a 30 $\degree$ incline. The coefficient of kinetic friction is 0.20. The attached string is parallel to the incline and passes over a massless, frictionless pulley at the top. Block B, with a mass of 3.0 kg, is attached to the dangling end of the string. The acceleration of B is:

A) 0.20 m/s², up
B) 0.20 m/s², down
C) 2.8 m/s², up
D) 2.8 m/s², down
E) 0 m/s²