$4\mathrm{.}25$ WP As shown in Fig. P$4\mathrm{.}25,$ air enters the diffuser of a jet en$-$

gine operating at steady state at $2\mathrm{.}65lb\frac{f}{i}n.{?}^2,389R$ and a velocity of

$869f\frac{t}{s},$ all data corresponding to high$-$altitude flight. The air flows adi$-$

abatically through the diffuser and achieves a temperature of $450R$

at the diffuser exit. Using the ideal gas model for air, determine the

velocity of the air at the diffuser exit, in $f\frac{t}{s}.$