Question

Please help?

Near the surface of the Earth, a wooden block with mass m = 2 kg is attached
to a string. The string is wrapped around a frictionless pulley with a radius
R = 0.5 m, and rotational inertia I = 2.5 kg·m^2 as shown in the figure. The
pulley and the block are initially at rest. When the system is released and the
string begins to unwind, what is the tension in the string (in N)?

Answer 1

Here's a drawing of the figure provided:

Answer 2

Just to clarify, I already have the answer. This is from an old college exam. I just want to know how to get the answer.