Thrust is the force that pushes a rocket forward. It is a force exerted on the rocket as the engine expels hot gases from the rear of the rocket. For most rockets, thrust is variable rather than constant during the "burn time" (the time interval during which fuel is consumed and expelled). However, the thrust of a certain rocket is nearly constant during part of its burn time, beginning when the rocket has consumed \(40 \%\) of its fuel and continuing until the rocket has consumed about \(90 \%\) of its fucl. As the rocket consumes and expels its fuel, its inertia decreases. Describe the rocket's acceleration during this interval of constant thrust.