A cord is wound around a uniform disk of mass m = 2.5 kg and radius R = 10 cm. A person pu...

A cord is wound around a uniform disk of mass m = 2.5 kg and radius R = 10 cm. A person pulls on the cord to the right with a constant horizontal force P. The disk is initially at rest and rolls without slip. Determine P if the center of the disk has a speed of 0.5 m/s after the hand pulling the cord displaces horizontally to the right by 20 cm.

Figure P8.26