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$2 / 178$ The member $O A$ of the industrial robot telescopes. At the instant represented, $\phi=60^{\circ}, \dot{\phi}=1.2 \mathrm{rad} / \mathrm{s}$, $\ddot{\phi}_{. .}=0.8 \mathrm{rad} / \mathrm{s}^{2}, \quad \overline{O A}=0.9 \mathrm{~m}, \quad \overline{O A}=0.5 \mathrm{~m} / \mathrm{s}$, and $O A=-6 \mathrm{~m} / \mathrm{s}^{2}$. The base of the robot is revolving at the constant rate $\omega=1.4 \mathrm{rad} / \mathrm{s}$. Calculate the magnitudes of the velocity and acceleration of joint $A$. Problem 2/178

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