Caryn purchases an electronic telescope that automatically extends and rotates the lens to focus on incoming meteors in a meteor shower. In this instance, the telescope tube is elevating and extending at the same time. At a given instant, $\theta = 45^\circ$, $\dot{\theta} = 10 \frac{deg}{s} = constant$, $l = 0.5m$, $\dot{l} = 0.2 \frac{m}{s}$, $\ddot{l} = -0.3 \frac{m}{s^2}$. Find the magnitude of the velocity $v$ (in $m/s$) and acceleration $a$ (in $m/s^2$) of the lens at point 'P'. Also, express $v$ and $a$ in terms of the unit vectors $i$ and $j$. [Ans. to Check: $|v| = 0.3296 m/s$]