The device shown below is the Atwood's machine. Assuming that the masses of the string and the frictionless are negligible. The masses of the two blocks are m1=40.0kg and m2=60.0kg.

A: Draw the free-body diagrams of m1 and m2. Please list all the forces.

B: What is the magnitude of the acceleration of the two blocks?

C: What is the magnitude of the tension in the string?