A Mass M = 4

Multiple Choice

A mass m = 4.0 kg is connected,as shown,by a light cord to a mass M = 6.0 kg,which slides on a smooth horizontal surface.The pulley rotates about a frictionless axle and has a radius R = 0.12 m and a moment of inertia I = 0.090 kg.m².The cord does not slip on the pulley.What is the magnitude of the acceleration of m?

A) 2.4 m/s²
B) 2.8 m/s²
C) 3.2 m/s²
D) 4.2 m/s²
E) 1.7 m/s²