4) A uniform rod (M = 2.0 kg, L = 2.0 m) is held vertical about a pivot at point P, a distance L/4 from one end (as in the Figure). The rotational inertia of the rod about P is 1.17 kg*m**2. If it starts rotating from rest, what is the linear speed of the lowest point of the rod as it passes again through the vertical position (v)?
  
   A1 8.7  m/s
   A2 4.8  m/s
   A3 17   m/s
   A4 2.4  m/s 
   A5 zero