The robot arm is elevating and extending simultaneously. at a given instant, θ = 30°, ˙ θ = 10 deg / s = constant θ˙=10 deg/s=constant , l = 0.5 m, ˙ l = 0.2 m / s l˙=0.2 m/s , and ¨ l = − 0.3 m / s 2 l¨=−0.3 m/s2 . 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.