The robot arm is elevating and extending simultaneously. At a given instant, 0 = 30, = 10 deg/ s = constant, l = 0.5m, i = 0.2m/s, and 1= -0.3m/s. Compute the magnitudes of the velocity v and acceleration a of the gripped part P. In addition, express v and a in terms of the unit vectors i and j. 0.75 m P