The string in a yo-yo is wound around an axle

The string in a yo-yo is wound around an axle

Subject: Physics    / General Physics
Question

The string in a yo-yo is wound around an axle of radius 0.550 cmThe yo-yo has both rotational and translational motion, like a rolling object, and has mass 0.155 kg and outer radius 1.80 cm Starting from rest, it rotates and falls a distance of 1.15 m(the length of the string). Assume for simplicity that the yo-yo is a uniform circular disk and that the string is thin compared to the radius of the axle.

a. What is the speed of the yo-yo when it reaches the distance of 1.15 m

b. How long does it take to fall?