The end \( B \) of uniform \( \operatorname{rod} A B \) which makes...

The end \( B \) of uniform \( \operatorname{rod} A B \) which makes angle \( \theta \) with the floor is being pulled with a velocity \( v_{0} \) as shown. Taking the length of the rod as I, calculate the following at the instant when \( \theta=37^{\circ} \)
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(a) The velocity of end \( \mathrm{A} \)