Required information

Problem $15\mathrm{.}164-$ A boom lift in motion

At the instant shown, the length of the boom $AB$ is being decreased at the constant rate of $0\mathrm{.}170\frac{m}{s}$ and the boom is being lowered at the constant rate of $0\mathrm{.}08ra\frac{d}{s}.$

Problem $15\mathrm{.}164.$b $-$ Acceleration of the boom lift

Determine the acceleration of Point $B.$

The acceleration of Point $B$ is $*m\frac{m}{s^2}$

The angle is $\stackrel{}{x}-($Round the final answer to three decimal places.$)$