The slider P can be moved inward by means of the string S, while the slotted arm rotates about point O. The angular position of the arm is given by 0= 0.68t - 0.042t2, where 0 is in radians and t is in seconds. The slider is at r = 1.41 m when t = 0 and thereafter is drawn inward at the constant rate of 0.10 m/s. Determine the velocity v and acceleration a of the slider when t = 4.2 s. Express your answers in the x-y coordinate system. P S Answers: At t = 4.2 s, V i it j) m/s a = i+ j) m/$ 2