A jump jet of mass (without fuel) can hover, stationary, by burning fuel and blasting the waste products downwards at a constant velocity of (relative to the jet). It is carrying of fuel.
How long, in seconds, can the jump jet hover like this before it runs out of the fuel?
Assume that the fuel contains all of the reactants: i.e. no air is being drawn from outside. (A real jump jet would take in air from outside, which would make up a substantial fraction of the exhaust mass.)
Take the acceleration due to gravity to be .
Give your answer to 1 decimal place.