The uniform 8.05-lb bar AGB is attached to two collars of negligible weight that slide with negligible

Question:

The uniform 8.05-lb bar AGB is attached to two collars of negligible weight that slide with negligible friction along fixed rods. Its motion is controlled by the force P applied to collar A. Knowing that at the instant shown the speed and acceleration of collar A are 2 ft/s and zero, respectively, determine

(a) The applied force P,

(b) The force exerted by the fixed rod on the collar at A.