A four$-$component Tsiolkovsky rocketLength$=6$m Structural mass $=60$kgPropellant mass $=150$kgSpecific Impulse $=280$sBurn time $=8$sYou can assume in what follows that the rocket rises vertically and experiences a constant deceleration due to gravity of $9\mathrm{.}81$ms$-2.$ Aerodynamic forces on the rockets can be ignored.You can assume the transfer of fuel between tanks is fast and, for simplicity, allocate no time to this process in your calculations.$($a$)$ What is the exhaust velocity of each of the rockets?