A uniform flow of standard air at \(60 \mathrm{~m} / \mathrm{s}\) enters a plane-wall diffuser with negligible boundary-layer thickness. The inlet width is \(75 \mathrm{~mm}\). The diffuser walls diverge slightly to accommodate the boundary-layer growth so that the pressure gradient is negligible. Assume flat-plate boundary-layer behavior. Explain why the Bernoulli equation is applicable to this flow. Estimate the diffuser width \(1.2 \mathrm{~m}\) downstream from the entrance.