$4\mathrm{.}30.$ During ejection from a military airplane, the pilot's acceleration must not exceed $16$ g if

injury is to be avoided $($see Ref. $[5]).$ Assuming the ejection pulse to be triangular, what is

the maximum peak acceleration of the ejection pulse applied to the pilot? Assume as in

Example $4\mathrm{.}3\mathrm{.}3$ that the seated pilot of $160$ lb can be modeled with a spinal spring stiffness

of $k=450l\frac{b}{i}n.$