The small cart is released from rest in position $1$ and requires $0\mathrm{.}638$ seconds to reach position $2$ at the bottom of the path, where its

center $G$ has a velocity of $14\mathrm{.}20f\frac{t}{sec}.$ Determine the angular velocity $$ of line $AB$ in position $2$ and the average angular velocity $av$

of $AB$ during the interval.