A particle is moving along the x -axis with its coordinate with...

A particle is moving along the $x$ -axis with its coordinate with time $t$ given by $x\left(t\right) = 10 + 8t - 3{t}^{2} .$ Another particle is moving along the $y$ -axis with its coordinate as a function of time given by $y\left(t\right) = 5 - 8{t}^{3} .$ At $t = 1s,$ the speed of the second particle as measured in the frame of the first particle is given as $\sqrt{v} .$ Then $v\left(inm{s}^{- 1}\right)$ is ___________.