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 rotatinal 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